Trailer Lights INOP

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Jan 7, 2012 | 01:13 PM

ron2681

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Trailer Lights INOP

My trailers lights arent working at all- so frustrated right now!! Ive checked all the fuses and those are good, ive got no power back to the 7 pin connector, anyone encountered this, it doesnt help that when it comes to electrical i'm an idiot so i need some input from those of you who are savvy when it comes to that sort of thing-thanks!

Jan 7, 2012 | 11:16 PM

air1jpg

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From: Louisville

Have you intalled the relay switch for the 7 pin connector that goes into the fuse box?

Jan 8, 2012 | 12:17 PM

ron2681

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Well this is a factory setup so it should already be there. They were working just fine one evening when I hooked up my trailer then when i moved the truck around the barn they went out.

Jan 9, 2012 | 11:03 AM

Rudeman

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From: Belleville IL

Quote:

Originally Posted by ron2681

Well this is a factory setup so it should already be there. They were working just fine one evening when I hooked up my trailer then when i moved the truck around the barn they went out.

Isn't there a second fuse to protect the main (truck) circuit from being damaged by faulty trailer wiring?

Jan 9, 2012 | 11:44 AM

kevincw

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From: Dixmont Maine

Double check all the fuses, their are separate fuses for trailer lights.

Jan 9, 2012 | 09:29 PM

air1jpg

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From: Louisville

Quote:

Originally Posted by Rudeman

Isn't there a second fuse to protect the main (truck) circuit from being damaged by faulty trailer wiring?

Yep, check the fuses and then take an volt/ohlm meter and check the wiring on the trailer for a short.

Jan 10, 2012 | 08:40 AM

RV_Tech

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From: Bristol, TN.

When you lose all the lights as you describe, you more than likely lost your ground. Are you checking for power at your seven pin using the ground terminal in the seven pin, or are you using a chassis ground?

Steve

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Jan 10, 2012 | 07:24 PM

RV_Tech

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From: Bristol, TN.

Quote:

Originally Posted by ron2681

i was using chassis ground, i think the trailer wiring is good because it works fine on other trucks. Should I try using the ground terminal in the seven pin? Thanks again for all the good advice.

Ron,

Are you using a test light or a meter to take your readings? The reason I focus on a ground is that is the problem about 90% of the time. It does sound like the trailer wiring is fine. Getting good contact at the seven pin can be a problem and often is.

Steve