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Old 11-27-2008, 09:43 AM
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Trailer Lights

I have a 2005 GMC Envoy for which I use to pull a trailer. I am not getting any voltage to the factory installed plug for tail lights, all other functions work. The trailer wiring harness plug in adapter has LED indicators and the one for tail lights does not come on. I checked inside plug on Envoy with voltmeter and no voltage. I checked Fuse Box and there is a fuse marked TRAILER and it is not blown??? Any suggestions on where to look? Or does it just need a quick trip to dealer?? THANKS Dave Shank

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Old 11-27-2008, 11:54 AM
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Check for power at the fuse box to see if there is voltage on the downstream side of the fuse..if that is the case you have a break in the wire between the fusebox and the trailer plug..then it is a matter of tracing the wire back to find where the issue lies..this is a lot of labor and 50 cents to fix in most cases..

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Old 11-27-2008, 11:58 AM
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Just guessing, but maybe it's a frayed wire near where the factory wiring for your truck passes thru the frame. Start doing a real close inspection the whole length. Might also be a bad ground near a tail light assembly. Since I take it that the trailer is probably older than '05, that would be where I'd start looking next.


In a while, Chet.
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Old 11-27-2008, 12:47 PM
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It should not be the ground as all of the other functions work. The only one not working is TRAILER LIGHTS. Where would wire go to from OEM Adapter Plug? Straight to Fuse Box or tie into tail light circuit on rear of car. I checked wire connections at receipticle and they look okay but I do not know where they go from there as they disapper up into chassis in a bundle. Where would be next stop for the Tail light wire??? THANKS... Dave Shank
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Old 11-28-2008, 09:28 AM
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I found the solution:: There is a SECOND fuse box under backseat on GMC Envoy and fuse for TRAILER/PARK 10 amp was blown. Trailer Guy told me that if you drive thru heavy rain it can easily pop a fuse. Best solution to wrap tape over plug. . . THANKS. . . Dave Shank
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