Question about 2002 Ford F250 Super Duty SuperCab

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2005 F250 Trailer lights

I have a 2005 F250. I just installed new lights and wiring on my trailer and cannot get the lights to work other than the passenger side running light. I went to the harness with a test light and was only able to get current at the running light. No hot at the turn signal or brakes. Is this a fuse? I know its not the wiring as I just put it on about 3 hrs ago and triple checked my work.

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  • KEN LaPOINT
    KEN LaPOINT May 11, 2010

    You may want to make sure that the wires are connected to the proper terminal. I've run into situations where the harness pigtail to the truck connector had one wire connected in the wrong place... it wasn't the trailer, but when connected to the trailer it would blow fuses..
    I am a little suspicious if you only have one running light... the running lights are all hooked to the same circuit, you may want to recheck that as well.... Hope this helps a bit.


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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.
to get the both rear brake lights to come on you have to run a red wire from the brake light on the live wire side to the light on the opposite side to give it power when you apply the brakes for it to light up.
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
ther should be an earth wire from the plug that has to earth the trailer, all the lights also have to be earthed as they will not work if they aren't.
Try that and see how you go, if you do it right they should work for you

Posted on May 14, 2009

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