Question about 2002 Ford F150 Regular Cab

1 Answer

TRAILER LIGHTS MY 7 PIN CONNECTOR HAS POWER FOR FLASHERS AND TURN SIGNALS BUT NOT FOR TAIL LIGHTS. I CHECKED THE WIRING HARNESS CONNECTOR ABOVE THE SPARE TIRE THERE IS NO TAILLIGHT POWER THERE. SO I CHECKED FUSE #5 AS PER MY OWNERS MANUAL - IT IS OK. CAN YOU TELL ME IF THERE ARE ANY OTHER CONNECTORS IN THE WIRING HARNESS AND/OR IS THERE AN INTERCEDING RELAY SOMEWHERE THAT MAY HAVE FAILED

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  • JOEDOLLMAN Aug 28, 2008

    Fuse 5 that I mentioned is the one called out for "trailer parking and backup lights" it is ok. I also checked the 2 fuses labeled for the left and right trailer flasher and brake lights they are ok. I do not have a electric brake of auxiliary power relay installed so there are no fuses in those circuits. If there is a relay in the trailer tail light circuit I would suspect it to be in the box located under the hood. Everything worked a few weeks ago so I have to think I had a component failure somewhere



    Thanks for taking the time to post an answer

  • JOEDOLLMAN Aug 31, 2008

    I actually have a truck that uses those two relays. They are for the electric trailer brakes and trailer battery charging circuits. On my truck they feed other pins in my round connector and are not connected to the flat four connector



    I found the problem. Relay 201 in the fuse box under the hood feeds the trailer tail lights . It is the left most relay (drivers side) on the first row of 4 ice cube relay. In my case the relay was fine. It turns out that there is a splice inside the wiring harness where the flat four connector and the round connector are hooked together. There are 4 splices for the white, green, brown and yellow wires. They are spread out over the length of the wiring harness between the bumper and the wiring harness connector next to the spare tire. You have to pry the harness out of the plastic jacket and start poking around to find them.



    A little solder and some heat shrink tubing an all is well



    I guess it could have been worse



    Thanks again

  • Anonymous Mar 13, 2009

    I have turn signals, flashers & brake lights - no running lights though???

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Did you check the fuses under the hood?

Posted on Aug 28, 2008

  • paul erickson
    paul erickson Aug 29, 2008

    most people just have the fuses blow and only look under the dash i had a customer that kinda the same problem there is a Relay box attached to main under hood fuse box. This box is not shown in
    owners manual. Your looking for the two small rectangular relays closest to the
    engine, they sit side by side. Not to be confused with the small box with the
    5amp and 20amp fuse shown in the manual. This box sits where the manual shows
    the smaller box is mounted. Who would think both relays could be bad?


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accessconnect_logo.jpg


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