Fuse Box Diagrams Ford F-150 (2004-2008) - Fusesinfo.com (2024)

Page Contents:

In this article, you will find information about the fuses of the Ford F-Series F-150 (models 2004, 2005, 2006, 2007, and 2008), including diagrams of the fuse boxes, a list of fuses and relays, their designation, and the location of the fuse blocks within the vehicle.

Fuse Box Diagrams Ford F-150 (2004-2008) - Fusesinfo.com (1)

Checking and Replacing Fuses in Ford F-150

If electrical components in the vehicle are not working, a fuse may have blown. Blown fuses are identified by a broken wire within the fuse. Check the appropriate fuses before replacing any electrical components.

Caution!

  • Always replace a fuse with one that has the specified amperage rating. Using a fuse with a higher amperage rating can cause severe wire damage and could start a fire.
  • Always disconnect the battery before servicing high current fuses.
  • To reduce risk of electrical shock, always replace the cover to the Power Distribution Box and Auxiliary Relay Box before reconnecting the battery or refilling fluid reservoirs.

Location of Fuse Boxes

Passenger compartment fuse panel:
The fuse panel is located under the right-hand side of the instrument panel. Remove the trim panel and fuse box cover to access the fuses.
To remove the fuse box cover, place a finger behind the PULL tab and your thumb above the PULL tab as shown in the illustration, then pull the cover off.
To reinstall the fuse box cover, place the top part of the cover on the fuse panel, then push the bottom part of the cover until you hear it click shut. Gently pull on the cover to make sure it is seated properly.Fuse Box Diagrams Ford F-150 (2004-2008) - Fusesinfo.com (2)

Auxiliary relay box:
The relay box is located in the engine compartment on the left fender.Fuse Box Diagrams Ford F-150 (2004-2008) - Fusesinfo.com (3)

Fuse Box Diagrams

2004

Passenger Compartment Fuses

Fuse Box Diagrams Ford F-150 (2004-2008) - Fusesinfo.com (4)

List of fuses in the Passenger compartment fuse panel (2004)

ADescription
110ARun/Accessory - Wipers, Instrument cluster
220AStop/Turn lamps, Speed control deactivate switch
35APower mirrors, Memory logic power, Memory seats and pedals
410ADVD battery power
57.5AKeep alive memory for Powertrain Control Module (PCM) and climate control module
615AParklamps, BSM, Instrument panel illumination
75ARadio (start signal)
810AHeated mirrors, Switch indicator
9-Not used
1020ATrailer tow back-up lamps relay (PCB1), Trailer tow parklamp relay (R201)
1110AA/C clutch, 4x4 solenoid
12-Not used
1310AClimate control module power
1410ABack-up lamp and Daytime Running Lamps (DRL) relay coil, A/C pressure switch, Brake-shift interlock solenoid, Heated PCV
155AOverdrive cancel, Cluster, Brake-Shift Interlock (BSI)
1610AABS module (Run/Start power)
1715AFog lamp relay (R202)
1810ARun/Start feed - Flasher relay, Electrochromatic mirror, Heated seats, BSM, Compass, RSS (Reverse Sensing System)
1910ARestraints (Air bag module)
2015APCM 4x4 power
2115ACluster keep alive power
2210ADelayed accessory power for audio, power door lock switch and moonroof switch illumination
2310ARH low beam headlamp
2415ABattery saver power for demand lamps
2510ALH low beam headlamp
2620AHorn relay (PCB3), Horn power
275APassenger Air bag Deactivation (PAD) warning lamp, Cluster air bag warning lamp, Cluster RUN /START power
285ASecuriLock transceiver (PATS)
2915APCM 4x4 power
30-Not used
3120ARadio power
3215AVapor Management Valve (VMV), A/C clutch relay, Canister vent, Heated Exhaust Gas Oxygen (HEGO) sensors #11 and #21, CMCV, Mass Air Flow (MAF) sensor, VCT
3315AShift solenoid, CMS #12 and #22
3420AFuel injectors and PCM power
3520AInstrument cluster high beam indicator, High beam headlamps
3610ATrailer tow right tum/stop lamps
3720ARear power point
3825ASubwoofer power
3920AInstrument panel power point
4020ALow beam headlamps, DRL
4120ACigar lighter, Diagnostic connector power
4210ATrailer tow left turn/stop lamps
10130AStarter solenoid
10220AIgnition switch feed
10320AABS valves
104-Not used
10530AElectric trailer brakes
10630ATrailer tow battery charge
10730APower door locks (BSM)
10830APassenger power seat
10930ADriver power seat, Adjustable pedals
110-Not used
11130A4x4 relays
11240AABS pump power
11330AWipers and washer pump
11440AHeated backlite, Heated mirror power
115-Not used
11630ABlower motor
117-Not used
11830AHeated seats
40130A Circuit breakerPower windows, Moonroof, Power sliding backlite
R01Full ISO relayStarter solenoid
R02Full ISO relayAccessory delay
R03Full ISO relayHi-beam headlamps
R04Full ISO relayHeated backlite
R05Full ISO relayTrailer tow battery charge
R06Full ISO relayBlower motor
R201Half ISO relayTrailer tow park lamps
R202Half ISO relayFog lamps
R203Half ISO relayPCM
Auxiliary relay box

Fuse Box Diagrams Ford F-150 (2004-2008) - Fusesinfo.com (5)

ADescription
F015AClockspring illumination
R01-4x4 CCW
R02-4x4 CW
R03-Daytime Running Lamps (DRL) (if equipped, otherwise not used)
R201-DRL
R202-A/C clutch
D01-A/C clutch diode

2005

Passenger Compartment Fuses

Fuse Box Diagrams Ford F-150 (2004-2008) - Fusesinfo.com (6)

List of fuses in the Passenger compartment fuse panel (2005)

ADescription
110ARim/Accessory - Wipers, Instrument cluster, Audio for XL/STX
220AStop/Turn lamps, Brake on/off switch
35APower mirrors, Memory seats and pedals
410ADVD battery power, Power fold mirror
57.5AKeep alive memory for Powertrain Control Module (PCM) and climate control module
615AParklamps, BSM, Instrument panel illumination
75ARadio (start signal)
810AHeated mirrors, Switch indicator
9-Not used
1020ATrailer tow back-up lamps relay (PCB1), Trailer tow parklamp relay (R201)
1110AA/C clutch, 4x4 solenoid
12-Not used
1310AClimate control module power, Flasher relay
1410ABack-up lamp and Daytime Running Lamps (DRL) relay coil, A/C pressure switch, Redundant speed control switch, Heated PCV (5.4L), Trailer tow back-up lamps relay coil, ABS, Reverse park aid, EC mirror
155AOverdrive cancel, Cluster
1610ABrake-shift interlock solenoid
1715AFog lamp relay (R202)
1810ARun/Start feed - Overhead power point, Electrochromatic mirror, Heated seats, BSM, Compass, RSS (Reverse Sensing System)
1910ARestraints (Air bag module)
2010ABattery feed for overhead power point
2115ACluster keep alive power
2210ADelayed accessory power for audio, power door lock switch and moonroof switch illumination
2310ARH low beam headlamp
2415ABattery saver power for demand lamps
2510ALH low beam headlamp
2620AHorn relay (PCB3), Horn power
275APassenger Air bag Deactivation (PAD) warning lamp, Cluster air bag warning lamp, Cluster RUN /START power
285ASecuriLock transceiver (PATS)
2915APCM 4x4 power
3015APCM 4x4 power
3120ARadio power
3215AVapor Management Valve (VMV), A/C clutch relay, Canister vent, Heated Exhaust Gas Oxygen (HEGO) sensors #11 and #21, CMCV, Mass Air Flow (MAF) sensor, VCT, Heated Positive Crankcase Ventilation (PCV) valve (4.2L engine), CID sensor (4.2L engine)
3315AShift solenoid, CMS #12 and #22, 4.6L/4.2L EGR
3420AFuel injectors and PCM power, Intake Manifold Runner Control (4.2L engine)
3520AInstrument cluster high beam indicator, High beam headlamps
3610ATrailer tow right turn/stop lamps
3720ARear power point
3825ASubwoofer power
3920AInstrument panel power point
4020ALow beam headlamps, DRL
4120ACigar lighter, Diagnostic connector power
4210ATrailer tow left turn/stop lamps
10130AStarter solenoid
10220AIgnition switch feed
10320AABS valves
104-Not used
10530AElectric trailer brakes
10630ATrailer tow battery charge
10730APower door locks (BSM)
10830APassenger power seat
10930ADriver power seat, Adjustable pedals
110-Not used
11130A4x4 relays
11240AABS pump power
11330AWipers and washer pump
11440AHeated backlite, Heated mirror power
115-Not used
11630ABlower motor
117-Not used
11830AHeated seats
40130A Circuit breakerPower windows, Moonroof, Power sliding backlite
R01Full ISO relayStarter solenoid
R02Full ISO relayAccessory delay
R03Full ISO relayHi-beam headlamps
R04Full ISO relayHeated backlite
R05Full ISO relayTrailer tow battery charge
R06Full ISO relayBlower motor
R201Half ISO relayTrailer tow park lamps
R202Half ISO relayFog lamps
R203Half ISO relayPCM
Auxiliary relay box

Fuse Box Diagrams Ford F-150 (2004-2008) - Fusesinfo.com (7)

ADescription
F035AClockspring illumination
R01Full ISO Relay4x4 CCW
R02Full ISO Relay4x4 CW
R031/2 ISO RelayDaytime Running Lamps (DRL) high beam disable
R201RelayDRL
R202RelayA/C clutch
D01DiodeA/C clutch

2006

Passenger Compartment Fuses

Fuse Box Diagrams Ford F-150 (2004-2008) - Fusesinfo.com (8)

Designation of the fuses in the Passenger compartment fuse panel (2006)

ADescription
110ARun/Accessory - Wipers, Instrument cluster, Audio for XL/STX
220AStop/Turn lamps, Brake on/off switch
37.5APower mirrors, Memory seats and pedals
410ADVD battery power, Power fold mirror
57.5AKeep alive memory for Powertrain Control Module (PCM) and climate control module
615AParklamps, BSM, Instrument panel illumination
75ARadio (start signal)
810AHeated mirrors, Switch indicator
920AFuel pump relay, Fuel injectors, Intake manifold runner control (4.2L)
1020ATrailer tow back-up lamps relay (PCB1), Trailer tow parklamp relay (R201)
1110AA/C clutch, 4x4 solenoid
125APCM relay coil
1310AClimate control module power, Flasher relay
1410ABack-up lamp and Daytime Running Lamps (DRL) relay coil, A/C pressure switch, Redundant speed control switch, Heated PCV (5.4L), Trailer tow back-up lamps relay coil, ABS, Reverse park aid, EC mirror
155AOverdrive cancel, Cluster
1610ABrake-shift interlock solenoid
1715AFog lamp relay (R202)
1810ARun/Start feed - Overhead power point, Electrochromatic mirror, Heated seats, BSM, Compass, RSS (Reverse Sensing System)
1910ARestraints (Air bag module)
2010ABattery feed for overhead power point
2115ACluster keep alive power
2210ADelayed accessory power for audio, power door lock switch and moonroof switch illumination
2310ARH low beam headlamp
2415ABattery saver power for demand lamps
2510ALH low beam headlamp
2620AHorn relay (PCB3), Horn power
275APassenger Air bag Deactivation (PAD) warning lamp, Cluster air bag warning lamp, Cluster RUN /START power
285ASecuriLock transceiver (PATS), PCM IGN monitor
2915APCM 4x4 power
3015APCM 4x4 power
3120ARadio power
3215AVapor Management Valve (VMV), A/C clutch relay, Canister vent, Heated Exhaust Gas Oxygen (HEGO) sensors #11 and #21, CMCV, Mass Air Flow (MAF) sensor, VCT, Heated Positive Crankcase Ventilation (PCV) valve (4.2L engine), CID sensor (4.2L engine), 4.6L/4.2L EGR
3315AShift solenoid, CMS #12 and #22, Ignition coils
3415APCM power
3520AInstrument cluster high beam indicator, High beam headlamps
3610ATrailer tow right turn/stop lamps
3720ARear power point
3825ASubwoofer power
3920AInstrument panel power point
4020ALow beam headlamps, DRL
4120ACigar lighter, Diagnostic connector power
4210ATrailer tow left turn/stop lamps
10130AStarter solenoid
10220AIgnition switch feed
10320AABS valves
104-Not used
10530AElectric trailer brakes
10630ATrailer tow battery charge
10730APower door locks (BSM)
10830APassenger power seat
10930ADriver power seat, Adjustable pedals
110-Not used
11130A4x4 relays
11240AABS pump power
11330AWipers and washer pump
11440AHeated backlite, Heated mirror power
115-Not used
11630ABlower motor
117-Not used
11830AHeated seats
40130A Circuit breakerPower windows, Moonroof, Power sliding backlite
R01Full ISO relayStarter solenoid
R02Full ISO relayAccessory delay
R03Full ISO relayHi-beam headlamps
R04Full ISO relayHeated backlite
R05Full ISO relayTrailer tow battery charge
R06Full ISO relayBlower motor
R201Half ISO relayTrailer tow park lamps
R202Half ISO relayFog lamps
R203Half ISO relayPCM
Auxiliary relay box

Fuse Box Diagrams Ford F-150 (2004-2008) - Fusesinfo.com (9)

ADescription
F035AClockspring illumination
R01Full ISO Relay4x4 CCW
R02Full ISO Relay4x4 CW
R031/2 ISO RelayDaytime Running Lamps (DRL) high beam disable
R201RelayDRL
R202RelayA/C clutch
D01DiodeA/C clutch

2007

Passenger Compartment Fuses

Fuse Box Diagrams Ford F-150 (2004-2008) - Fusesinfo.com (10)

List of fuses in the Passenger compartment fuse panel (2007)

ADescription
110ARun/Accessory - Wipers, Instrument cluster, Audio for XL/STX
220AStop/Turn lamps, Brake on/off switch, Hazard flashers
37.5APower mirrors, Memory seats and pedals, Driver power seat
410ADVD battery power, Power fold mirror
57.5AKeep alive memory for Powertrain Control Module (PCM) and climate control module
615AParklamps, BSM, Instrument panel illumination
75ARadio (start signal)
810AHeated mirrors, Switch indicator
920AFuel pump relay, Fuel injectors, Intake manifold runner control (4.2L)
1020ATrailer tow back-up lamps relay (PCB1), Trailer tow parklamp relay (R201)
1110AA/C clutch, 4x4 solenoid
125APCM relay coil
1310AClimate control module power, Flasher relay
1410ABack-up lamp and Daytime Running Lamps (DRL) relay coil, A/C pressure switch, Redundant speed control switch, Heated PCV (5.4L), Trailer tow back-up lamps relay coil, ABS, Reverse park aid, EC mirror, Navigation radio (reverse input)
155AOverdrive cancel, Cluster, Traction control switch
1610ABrake-shift interlock solenoid
1715AFog lamp relay (R202)
1810ARun/Start feed - Overhead power point, Electrochromatic mirror, Heated seats, BSM, Compass, RSS (Reverse Sensing System)
1910ARestraints (Air bag module), OCS
2010ABattery feed for overhead power point
2115ACluster keep alive power
2210ADelayed accessory power for audio, power door lock switch and moon roof switch illumination
2310ARH low beam headlamp
2415ABattery saver power for demand lamps
2510ALH low beam headlamp
2620AHorn relay (PCB3), Horn power
275APassenger Air bag Deactivation (PAD) warning lamp, Cluster RUN /START power
285ASecuriLock transceiver (PATS), PCM IGN monitor
2915APCM 4x4 power
3015APCM 4x4 power
3120ARadio power, Satellite radio module
3215AVapor Management Valve (VMV), A/C clutch relay, Canister vent, Heated Exhaust Gas Oxygen (HEGO) sensors #11 and #21, CMCV, Mass Air Flow (MAF) sensor, VCT, Heated Positive Crankcase Ventilation (PCV) valve (4.2L engine), CID sensor (4.2L engine), 4.6L/4.2L EGR , Electronic fan clutch (4.6L/5.4L engines)
3315AShift solenoid, CMS #12 and #22, Ignition coils
3415APCM power
3520AInstrument cluster high beam indicator, High beam headlamps
3610ATrailer tow right turn/stop lamps
3720ARear power point, Center console power point
3825ASubwoofer power
39-Not used
4020ALow beam headlamps, DRL
41-Not used
4210ATrailer tow left turn/stop lamps
10130AStarter solenoid
10220AIgnition switch feed
10320AABS valves
104-Not used
10530AElectric trailer brakes
10630ATrailer tow battery charge
10730APower door locks (BSM)
10830APassenger power seat
10930ADriver power seat, Adjustable pedals, Memory module (pedals, seat, mirror)
11020ACigar lighter, Diagnostic connector power
11130A4x4 relays
11240AABS pump power
11330AWipers and washer pump
11440AHeated backlite, Heated mirror power
11520ANot used (Spare)
11630ABlower motor
11720AInstrument panel power point
11830AHeated seats
40130A Circuit breakerDelayed accessory power: Power windows, Moon roof, Power sliding backlite
R01Full ISO relayStarter solenoid
R02Full ISO relayAccessory delay
R03Full ISO relayHi-beam headlamps
R04Full ISO relayHeated backlite
R05Full ISO relayTrailer tow battery charge
R06Full ISO relayBlower motor
R201Half ISO relayTrailer tow park lamps
R202Half ISO relayFog lamps
R203Half ISO relayPCM
Auxiliary relay box

Fuse Box Diagrams Ford F-150 (2004-2008) - Fusesinfo.com (11)

e1-2007.xlsx

ADescription
F035AClockspring illumination
R01Full ISO Relay4x4 CCW
R02Full ISO Relay4x4 CW
R031/2 ISO RelayDaytime Running Lamps (DRL) high beam disable
R201RelayDRL
R202RelayA/C clutch
D01DiodeA/C clutch
D02DiodeOne Touch Integrated Start (OTIS)

2008

Passenger Compartment Fuses

Fuse Box Diagrams Ford F-150 (2004-2008) - Fusesinfo.com (12)

List of fuses in the Passenger compartment fuse panel (2008)

ADescription
F0110ARun/Accessory - Wipers, Instrument cluster, Audio for XL/STX
F0220AStop/Turn lamps, ABS, T/T electric brake module, PCM (BOO signal), turn signal mirrors, CHMSL
F037.5APower mirrors, Memory seats and pedals
F0410ADVD battery power, Power fold mirror
F057.5AKeep alive memory for Powertrain Control Module (PCM) and Climate control module
F0615AParklamps, Body Security Module (BSM), Instrument panel illumination
F075ARadio (start signal)
F0810AHeated mirrors, Switch indicator
F0920AFuel pump relay, Fuel injectors, Injector sense
F1020ATrailer tow back-up lamps relay, Trailer tow parklamp relay
F1110AA/C clutch, 4x4 solenoid
F125APCM relay coil
F1310AClimate control module power, Flasher relay
F1410ABack-up lamp and Daytime Running Lamps (DRL) relay coil, A/C pressure switch, Redundant speed control switch, Heated PCV (5.4L), ABS
F155AOverdrive cancel, Cluster
F1610ABrake-shift interlock solenoid
F1715AFog lamp relay
F1810AElectrochromatic mirror, Heated seats, BSM, Compass, RSS (Reverse Sensing System), Power rail
F1910ARestraints (Airbag module)
F2010APower rail
F2115ACluster keep alive power
F2210ADelayed accessory power for audio, power door lock switch and moon roof switch illumination
F2310ARH low beam headlamp
F2415ABattery saver power for demand lamps, Flex fuel
F2510ALH low beam headlamp
F2620AHorn
F275APassenger Airbag Deactivation (PAD) warning lamp, Cluster airbag warning lamp
F285ASecuriLock transceiver (PATS), PCM IGN monitor
F2915APCM 4x4 power
F3015APCM 4x4 power
F3120ARadio power, Satellite radio module
F3215AVapor Management Valve (VMV), A/C clutch relay, Canister vent, Heated Exhaust Gas Oxygen (HEGO) sensors #11 and #21, CMCV, Mass Air Flow (MAF) sensor, Variable Cam Timing (VCT), Heated Positive Crankcase Ventilation (PCV) valve (4.2L engine), CID sensor (4.2L engine), 4.6L/4.2L EGR
F3315AShift solenoid, CMS #12 and #22, Ignition coils
F3415APCM power, IMRC (4.2L)
F3520AInstrument cluster high beam indicator, High beam headlamps, DRL disable relay
F3610ATrailer tow right turn/stop lamps
F3720ARear power point
F3825ASubwoofer power
F39-Not used
F4020ALow beam headlamps, DRL
F41-Not used
F4210ATrailer tow left turn/stop lamps
F10130AStarter solenoid
F10220AIgnition switch feed
F10320AABS valves
F104-Not used
F10530AElectric trailer brakes
F10630ATrailer tow battery charge
F10730APower door locks (BSM)
F10830APassenger power seat
F10930ADriver power seat, Adjustable pedals, Memory module (pedals, seats)
F11020ACigar lighter, Diagnostic connector power
F11130A4x4 motor relays
F11240AABS pump power
F11330AWipers and washer pump
F11440AHeated backlite, Heated mirror power
F11520AMoonroof
F11630ABlower motor
F11720AInstrument panel power point
F11830AHeated seats
40130A Circuit breakerDelayed accessory power: Power windows, Power sliding backlite
R01Full ISO relayStarter solenoid
R02Full ISO relayAccessory delay
R03Full ISO relayHi-beam headlamps
R04Full ISO relayHeated backlite
R05Full ISO relayTrailer tow battery charge
R06Full ISO relayBlower motor
R201Half ISO relayTrailer tow park lamps
R202Half ISO relayFog lamps
R203Half ISO relayPCM
R301Printed circuit boardTrailer tow backup lamps
R302-Not used
R303Printed circuit boardFuel pump
R304Printed circuit boardBattery saver
R305Printed circuit boardHorn
Auxiliary relay box

Fuse Box Diagrams Ford F-150 (2004-2008) - Fusesinfo.com (13)

ADescription
F035AClockspring illumination
R01Full ISO Relay4x4 CCW
R02Full ISO Relay4x4 CW
R031/2 ISO RelayDaytime Running Lamps (DRL) high beam disable
R201RelayDRL
R202RelayA/C clutch
D01DiodeA/C clutch
D02DiodeOne Touch Integrated Start (OTIS)
Fuse Box Diagrams Ford F-150 (2004-2008) - Fusesinfo.com (2024)

FAQs

What fuse is the reverse light on a 2004 Ford F150? ›

Ford Mechanic: Kenny Z. HiCustomer Thank you for asking your question on JustAnswer. Fuse 14 in the interior fuse panel is for the reverse lamps.

Where's the fuse panel on a 2008 Ford F150? ›

The fuse panel is located under the right-hand side of the instrument panel. Remove the trim panel and fuse box cover to access the fuses. To remove the fuse box cover, place a finger behind the PULL tab and your thumb above the PULL tab as shown in the illustration, then pull the cover off.

Where are the cabin fuses located? ›

Most vehicles have two fuse boxes, with one under the hood and the other in the cabin. You can usually find the other fuse box in the dashboard on the driver's side, but some manufacturers also place it below the glove box. If the interior fuse box isn't there, you can try checking the luggage compartment.

What fuse controls rear lights? ›

Tail light fuse is sometimes called the “parking lamp” fuse and it may be located in the underhood fuse panel, which requires the removal of a cover. On the inside of the cover, the fuse position will be indicated.

What fuse controls reverse lights? ›

While there is usually a legend in the fuse panel lid, a more detailed version is usually in the owner's handbook, and, this may help as some fuses supply more than one item in many cases. There should be a fuse panel behind the coin tray, fuse 18 is for reverse lights.

What fuse controls warning lights? ›

Which Fuse Controls the Dashboard Gauge? The instrument cluster fuse manages the dashboard gauge of a vehicle. It uses electricity from the car battery to power various electronic components of the dashboard such as the different warning lights, gauges, and alarm systems.

Where are the two fuse panels located? ›

There are two fuse boxes, one located near the engine or under the hood and the other is located near the driver seat. The car fuse box under the hood protects engine components including engine control unit (ECU), cooling fan, ABS motor and battery.

Where is blown fuse located? ›

Here's how to replace a blown fuse:

Open the fuse box door. Inspect each fuse using a flashlight to find the one that is burned or melted (the working fuses will have a clear glass casing but the blown one will look cloudy or blackened).

Can a fuse be bad but not blown? ›

Sometimes a fuse is bad but not necessarily blown. In this case, the best way to test it is with a test light or a multimeter. These are both relatively inexpensive tools and provide an easy way of checking if there's a current running through the fuse.

How do I know if my engine compartment fuse is blown? ›

No Response from Accessories: Accessories such as the cigarette lighter, GPS, or phone charger not working are tell-tale signs of a blown fuse. Visual Inspection: Removing the fuse and inspecting it can also help. A blown fuse usually has a broken wire or a burnt appearance inside.

What are the symptoms of a bad mega fuse? ›

The result is sudden or intermittent loss of engine or vehicle electrical power. The vehicle may then restart and drive normally. This breakage occurs inside the sealed case of the fuse, and so is not visible. The MEGA Fuses may also pass a continuity test with an ohmmeter.

How do I know if my truck fuse is blown? ›

The filament must be continuous from one terminal to the other for current to flow. If the filament is broken through, there's melting visible, or there are black or brown burn marks inside or on the outer portion of the fuse, it's an indication the fuse is blown. Use a circuit tester/test light or DVOM.

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