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Author Topic:   Trailer Lighting Circuit
Linesidesonthefly posted 04-02-2006 12:48 PM ET (US)   Profile for Linesidesonthefly   Send Email to Linesidesonthefly  
I got done yesterday [re-wiring boat trailer] and tested [the trailer lighting circuits] today on a buddy's truck. Got running lights on both sides, and directionals both sides. Depress the brake pedal and got lights on drivers side. I did notice both filaments working on drivers side, not so on passenger side. Depress brakes again nothing on passenger side peroid, lights go out on passenger side completely. I checked all the stupid stuff. I think I have a pretty good ground.
What am I missing?
Chuck Tribolet posted 04-02-2006 09:20 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
Do the lights still work on the truck (blown fuse test)?
What truck? Does it need an adapter (has amber turn signals)?

A quick (one person) test for brake lights is to turn on the
four-way flashers.


Chuck Tribolet posted 04-02-2006 09:21 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
Are the trailer lights grounded to the trailer frame? Paint
and weathered galvanizing are both pretty good insulators.


jimh posted 04-02-2006 09:59 PM ET (US)     Profile for jimh  Send Email to jimh     
Sounds like a problem in your buddy's truck wiring.
Linesidesonthefly posted 04-03-2006 07:24 PM ET (US)     Profile for Linesidesonthefly  Send Email to Linesidesonthefly     
I just got back from having a new powerpack and plug installed on my 1998 Grand Cherokee Laredo. The old one had a hole burnt right thru the casing. No wonder it failed to work. The Jeep will serve as the primary tow vehicle. Everything was tested and is working as normal on the Jeep. I'll test it tomorrow on the boat trailer weather permitting.

It was suggested to me today at work to not ground directly to the trailer. I should run separate ground from the harness to a bolt on each light. I guess that ensures a proper and consistent ground. The use of Dialectric lube on the bulbs and connections was also suggested.

I think I'm on the right track. Thanks for the help. I'll let you know how I make out in a couple days.

pglein posted 04-05-2006 06:47 PM ET (US)     Profile for pglein  Send Email to pglein     
My solution to non-working trailer lights has always been to simply replace the entire system. It's worked every time, and for just $30, it's cost-effective as well.
Linesidesonthefly posted 04-05-2006 08:19 PM ET (US)     Profile for Linesidesonthefly  Send Email to Linesidesonthefly     
I did in fact start with a new harness on the trailer. Now there is also a new one on the Jeep. Everything is good to go.

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