Question about 2002 Ford F250 Super Duty SuperCab

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2004 F250 No brakelights/turn lights on trailer

I have a '04 F250 and the trailer's brakelights and turning indicators don't work, truck is fine. Trailer brakes work fine, just no stop/turn. The problem has been traced forward of the pigtail. All fuses under dash are fine. Can't find the fuse block under hood. There's no block, just harness connectors. What to try to check next.......

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  • Anonymous Mar 21, 2014

    I need to know which fuse is for the trailer lights, in the box under the hood.

  • Anonymous Mar 22, 2014

    see summary

  • Anonymous Mar 28, 2014

    I am checking with a voltmeter.



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You will need to get a 12 volt test light and check the trailer connector for a voltage signal to the trailer, it may also have seperate fuses under the hood for the trailer lights if the system is factory installed, federal law requires the 2 systems be isolated, if there are blown fuses find the short in the trailer before replacing fuse(s), with no exceptions the short is always in the trailer. Hint, check the fuses 1st.

Posted on Jul 28, 2008


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Not sure if you know that much about electrical wiring so I will go through it like you don't.
Take the trailer plug out of the female socket at the rear of the car, turn your running lights on, go to the female plug and using a test light check to see which one lights up the test light, that wire will be the running lights wire.
turn the running lights off and turn either your left or right indicator on and check at the plug to see which wire lights the tester, do this for the opposite indicator as well.
Turn the indicator off and get someone to hold their foot on the brake while you test the plug for power.
check the male plug at the rear wire terminals by putting it in the female plug and perform the same test as the female plug, if you have power to all the wires at the rear of the male plug go to the lights at the rear of the trailer and perform the same tests as before.
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Turn the ignition on and turn your left or right indicator on again and check the wire for that side, if that is ok do the same for the other side then the running lights, you will have to run another wire off the running light wire to the opposite side of the trailer to give that side power to the lights
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Try that and see how you go, if you do it right they should work for you

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