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post #1 of 10 (permalink) Old 07-28-2011, 12:39 AM Thread Starter
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trailer light problem

I have running lights, turn signals, but when I hit the brakes the trailer lights go out. going to fix tomorrow any suggestions???? My ground is good but will recheck tomorrow as well.

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post #2 of 10 (permalink) Old 07-28-2011, 04:20 AM
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Re: trailer light problem

What type of plugs (and maybe adapters) are you using? trailer 4 flat adapted to vehicle 7 round, etc.
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post #3 of 10 (permalink) Old 07-28-2011, 12:45 PM
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Re: trailer light problem

Rex, sounds like you have a direct short, probably from bare wires touching. I found the best thing to do when you start to have those kinds of problems is to rewire the trailer because it usually turns into fix this and that goes, fix that and something else goes.



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post #4 of 10 (permalink) Old 07-28-2011, 12:52 PM
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Re: trailer light problem

It still sounds like a grounding issue if your losing all lights. If it was a short or bare wire it should also be blowing fuses.
On several occasions I have found it easier to just replace the lights and wires then spend hours looking for something stupid. Fifty bucks and a half hour of your time can get you out of a bad situation.
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post #5 of 10 (permalink) Old 07-28-2011, 01:09 PM
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Re: trailer light problem

Yep, nothing more frustrating that trying to chase a wiring problem.



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post #6 of 10 (permalink) Old 07-28-2011, 01:23 PM
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Re: trailer light problem

Look at the hitch connection, where the trailer locks onto the ball. If the inside is corroded or rusted, u lose ur ground. A little sand paper, and a shot of wd-40, will correct it. Dont ask how I know!!!
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post #7 of 10 (permalink) Old 07-28-2011, 03:22 PM
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Re: trailer light problem

Ground - run a ground wire to all the lights on the trailer - grounding through the frame only lasts until corrosion starts and corrosion starts when the trailer gets wet.

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post #8 of 10 (permalink) Old 07-28-2011, 10:51 PM Thread Starter
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Re: trailer light problem

I use the standard 4 flat connector everytime I started looking at it today it started raining guess I'll do it tomorrow.
Probably going to rewire the entire trailer and run ground wires to each light as well end the problems
Thanks for the help.

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post #9 of 10 (permalink) Old 07-29-2011, 01:02 AM
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Re: trailer light problem

I can't really see how it's a trailer problem? You said both turn signals work individually, and the running lights work. Four wire setup, one is ground, running lights, and left and right turn signals. There is no brake wire, it just sends power to both turn signals at the same time. If they work individually, I can't see how there's anything wrong with them. That would make me target the tow vehicle first. Depending on how your plug there is wired I could better imagine a problem on that side.
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post #10 of 10 (permalink) Old 07-29-2011, 03:45 PM Thread Starter
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Re: trailer light problem

Bad connection I replaced the plug a couple years back and 1 of the wire connections was bad not sure why though I solder all my connections, wire could have broke ahead or after the solder joint.
Found this after running ground wires to each light. I was getting ready to run all new wires though probably should have just done it.

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