Question about 2003 Ford F250 Super Duty Crew Cab

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Trailer / towing light problem

We haul a horse trailer with our 2003 f 250 super duty. We got a trailer that had a problem with one of the kights ( while the running lights were on we had no turn signal or brake light but when the running lights were off it was fine ) so we started to trouble shoot the problem with the light. While working on it we had it plugged into the truck and had the running lights on so we could figure out the problem, we had all other lights except that one, then they all went off and we tested it, now we are not getting any power from the truck to the trailer, we checked the two fuses in the fuse panel of the truck and they looked fine, is there another fuse we need to look at?

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  • ctwpaints Sep 14, 2008

    I forgot to tell you we still have all the truck lights just no trailer lights ( marker and all )

  • ctwpaints Sep 14, 2008

    Ya the fuses are good

  • ctwpaints Sep 14, 2008

    could it be as simple as a bad ground on the trailer?

  • zena2daryl Jan 21, 2009

    All of the truck lights are working, I checked the trailer plug on the truck with a test light and found the power connection, left and right turn signal and brake lights are working, but the running lights are not working.

  • Anonymous Mar 22, 2014

    plug for trailer lights has no power all lights work on truck

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  • 183 Answers

Look under the hood in the power distribution box.Should be another fuse...

Posted on Sep 14, 2008

  • 1 more comment 
  • travis campbell Sep 14, 2008

    So you verified all of the fuses in the engine compartment (black box/power distribution box) are good.I believe the fuse is a 20 amp yellow mini....

  • travis campbell Sep 14, 2008

    Use a test light and probe the top of the fuse(both sides).If the light glows then check the wires from box to rear of truck..If you need wiring diagrams here is a realy good site,it costs 17 dollars per vehicle per year.But pretty much covers bumper to bumper.Well worth it...

    http://www.alldatadiy.com/

  • travis campbell Sep 14, 2008

    That could have been the original problem.But if you now have no power to truck pigtail with the trailer unhooked.Then the problem is with the truck..

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SOURCE: I need a fuse diagram for my 2000 Ford F 250 4x4

under hood is the 2 nd fuse box the first 4 small fuses towards front are all trailer light fuses ck them

Posted on Aug 09, 2010

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Instructions for wiring a moving trailer connector


accessconnect_logo.jpg


Trailer Wiring Diagrams 4 Way Systems

4 way flat molded connectors allow basic hookup for three lighting functions; right turn signal / stop light (green), left turn signal / stop light (yellow), taillight / license / side marker (brown) and a ground (white).

4%20way%20wiring.jpg 4way_vehicle.jpg 4 way tow vehicle side.
4way_trailer.jpg 4 way trailer side.
5 Way Systems

Same as 4 way system listed above but adds a extra blue wire for brake signal or auxiliary power. Used on pop up camper trailers or utility / boat trailers.
5way_vehicle.jpg 5 way tow vehicle side.
5way_trailer.jpg 5 way trailer side.
6 Way System, Rectangle Plug 3/4 inch by 1 inch 6 way rectangle connectors right turn signal (green), left turn signal (yellow), taillight (brown), ground (white). The red and blue wire can be used for brake control or auxiliary. Use on a small motorcycle trailer, snowmobile trailer or utility trailer. Can also be used as custom wiring on trailers with 3 light/wire systems. See "Tow Vehicle Taillight Wiring" below.
6way_rectangle_1.jpg 6 way tow vehicle side.
6way_rectangle_2.jpg 6 way trailer side.
6 Way Systems, Round Plug

Round 1 1/4" diameter metal connector allows 1 or 2 additional wiring and lighting functions such as back up lights, auxiliary 12v power or electric brakes. Note: The black (sometimes red) 12v and blue electric brakes wire may need to be reversed to suit the trailer. Check with a test light or VOM. Uses: horse trailer, travel trailers, landscaping trailer, car trailer, etc.


6way_vehicle.jpg 6 way tow vehicle side.
6way_trailer.jpg 6 way trailer side.
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7way_vehicle.jpg 7 way RV flat blade tow vehicle side.
7way_trailer.jpg 7 way RV flat blade trailer side.

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