Trailer Lights - Help!

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Trailer Lights - Help!

Postby Duder » Wed Jul 08, 2009 7:21 pm

All my trailer lights work except for my trailer turn signal and brake lights (double-filament bulbs). Anybody got any ideas? (By the way, new lights and bulbs the whole way 'round the trailer, and the ground is rock solid.)
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Re: Trailer Lights - Help!

Postby rustychev » Wed Jul 08, 2009 8:28 pm

For all lights I check the plug on the truck side, the ground, then power at the light to make sure its not cut some plase on the frame.
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Re: Trailer Lights - Help!

Postby ajmorell » Thu Jul 09, 2009 11:30 am

Yep, start by checking the plug at the truck end. One of those simple electrical tools that lights up when current is passed through it will work fine for this task. If that all checks out fine then you most likely have a short somewhere in the trailer wiring.
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Re: Trailer Lights - Help!

Postby LaRedneck » Thu Jul 09, 2009 5:57 pm

You can work back to front or vice versa, get a test light and check for power at the tail light. If no power then work your way up. Go about half way and probe the wire. No power move up till you find power then you know its between there somewhere.
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Re: Trailer Lights - Help!

Postby waterfowlhunter » Thu Jul 16, 2009 4:36 am

You do not have a short, if you did it would blow fuses and possible (depending on model) make your tow vehicle lights stop working, What you have is an OPEN in the ckt and if your tail (parking) lights work than the ground is fine. The White wire is the ground wire. the Yellow wire is Left turn and stop light the Brown is the Running lights (parking or tail as often called) and the Green is the Right turn and Stop.

If your colors do not match then you can hold the trailer end in your hand with the exposed 3 pins to the right then the far left pin is ground, next is running and then left turn / stop and then right turn / stop.

if you installed all new lights and the harness that came with them and matched the colors when connecting than the problem is most likely with your tow vehicle.

Did your truck come factory wired or did someone add a connector, if it is an add on sometimes they use crimp on splices that corrode and stop working, the better choice is to solder and heat shrink the connections.
Last edited by waterfowlhunter on Wed Jul 29, 2009 3:21 pm, edited 1 time in total.
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Re: Trailer Lights - Help!

Postby blineman » Wed Jul 29, 2009 3:11 pm

US built trucks have the same color codes , brown, tail marker, green, right turn, yellow left turn. white, ground . Ground your trailer to the truck useing a ground right off the trailer frame to the plug then right to your truck frame. Your turn signals will work as long as the brake lights come, interupter switch in the truck.


Most all problems with trailer lights is the GROUND. check the connection in the plug, even a little dirt or rust will weaken your power, you may have solid ground frame to frame but the pluc might be the culprit.
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