Question about 2002 Ford F250 Super Duty SuperCab

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Where are the fuses for the trailer turn signals on a 2003 F250 I have the same problem with my 01 Superduty. My turn signals and Hazard lights both stopped working at the same time. It may be coincidence but I rented a trailer with lights and they worked fine the entire 4 hour trip. The next day no signals or hazard lights at all.

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The fuses r located exactly behind the power distribution box.just check out properly before replacing. thanks.

Posted on Jan 05, 2009

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I think the following is the fuse map for your truck:

where are the fuses for - 51d12b2.jpg

Posted on Jan 05, 2009

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1 Answer

How do i find wiring diagram for stop lights


The STOP LP 25 A fuse in the underhood fuse block supplies battery positive voltage to the normally open stop lamp switch. When the driver presses the brake pedal, the switch contacts close and battery positive voltage is supplied to both the STOP 15 A fuse and the CHMSL 10 A fuse in the I/P fuse block, and to the turn signal/hazard module. The turn signal/hazard module then supplies voltage to both of the trailer rear turn/stop lamp supply voltage circuits. The voltage from the CHMSL 10 A fuse is to the center high mounted stop lamp (CHMSL) and the trailer jumper harness. The voltage from the STOP 15 A fuse is to the stop lamps, throttle actuator control (TAC) module, and the cruise control.
Do you know what a stop lamp switch is ? If so I would check it with a DVOM digital volt ohm meter , after you check fuse .
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Brake lights went out so I changed a blown fuse,now the brake lights wont shut off,so I replaced the brake switch at the pedal and still have the same issue,lights wont go off.


Which fuse did you replace ? The one in the under hood fuse box or one of the two in the I/P fuse box . Do the CHMSL - center high mount stop lamps work correctly ? Here is a description how they work .
Stop Lamps
The STOP LP 25 A fuse in the underhood fuse block supplies battery positive voltage to the normally open stop lamp switch. When the driver presses the brake pedal, the switch contacts close and battery positive voltage is supplied to both the STOP 15 A fuse and the CHMSL 10 A fuse in the I/P fuse block, and to the turn signal/hazard module. The turn signal/hazard module then supplies voltage to both of the trailer rear turn/stop lamp supply voltage circuits. The voltage from the CHMSL 10 A fuse is to the center high mounted stop lamp (CHMSL) and the trailer jumper harness. The voltage from the STOP 15 A fuse is to the stop lamps, throttle actuator control (TAC) module, and the cruise control.
Does yours have trailer light hook up ? If so check trailer wiring connector for corrosion . Also check the turn signal / hazard module .
Does

Aug 23, 2015 | 2003 Cadillac Escalade

1 Answer

Why does my turn signal/ hazard light fuse keep blowing out


you have a short in one of the light sockets or a worn wire from the wiring harness. could be the flasher assembly. are the turn signals different bulbs from the brake lights? Does using the brakes blow the fuse? (Rear lights or brake light switch on brake pedal). left or right turn signal blowing the fuse will tell which side has the short. 4 ways only, replace the relay.

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Turn signal flasher location 2003 suzuki XL-7


the FSM book covers this.
as does alldata.com, (USA cars)
checked fuses yet?
turn/back fuse.
feeds the.:
turnback relay & answer back relay (module)
a digital switch in the lever (combo) it just sends ground logic
level to the module.
so sound to me to be
one light is shorted. (or trailer wire hacks) "visual inspections!,"
or the module is bad.
if both sides are bad, seems bad module to me,
if all lights blink fully bright on hazard the lights should be good.

the module is just under the steering wheel , under those
plastic covers, the books shows simple access. to the combo
my book dont show module location
i use a rubber hose to my ear to find any relay, clicks.
if you find hazard click , (assuming it does) then same place
is the turn sigs.
its not in the fuse box, cab , i looked.


hope that helps.

alldata.com
has it.

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1 Answer

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does the 3rd brake light in the back window work? check fuses if fuses are OK and the hazard lights work, then the turn signal switch may be bad. I dont know what your sons suburban (trailer?)has to do with your navigator?

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sounds like it is either flasher or switch assembly.

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you have blown fuses from a shorted trailer harness, check all the fuses, both under the hood and inside the truck.

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