Question about 2008 GMC Envoy

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Trailer wiring No power to plug. Trailer lights stopped working is there a fuse

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  • GMC Master
  • 10,543 Answers

Trailer wiring uses the fuses for the car lights. Turn signal, running ans brake lights. Some plugs also charge the trailer battery if so wired. Check the ground wire for a good body connection. This wire often gets overlooked and can stop all trailer lights if it fails.

Posted on Jul 24, 2016

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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Benimur

Louie Role

  • 6966 Answers

SOURCE: no power to trailer running lights

Hi,

This is a known issue and to my knowledge there was even a recall order to correct this fault. It would seem the the wiring harness itself is the reason. You may want to reference these pages here and/or here.

Should you however prefer to perform a DIY, then you would need a DVM to check for voltages. This page shows the possible wiring scheme used by most manufacturers for trailer configuration.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.


Posted on Jun 10, 2008

Ron szarafinski

  • 217 Answers

SOURCE: trailer running lights

check trailer ground

Posted on Jan 18, 2009

farroutideas

Dale Farr

  • 78 Answers

SOURCE: wiring diagram or fuse box diagram-2007 GMC Envoy Denali

Hi there;

Here is the wiring diagram for the trailer wiring for your truck.
22593cd.jpg
Hope this helps
Farrout!

Posted on Mar 18, 2009

Anonymous

  • 1 Answer

SOURCE: 2006 GMC Sierra 2500HD 4WD trailer light connection fuse blown?

under the hood on drivers side right behind the battery. Will be marked trailer light left sand right.

Posted on Jun 27, 2009

pops296

Mike Tillman

  • 174 Answers

SOURCE: Trailer light wiring harness

try http://www.etrailer.com/faq-wiring.aspx. They have very good concise information that might help.

Posted on Oct 02, 2009

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I need a fuse diagram for a 2006 Ford F250 2WD. My lights all work great on the PU but when I connect the trailer the lights work but no brake lights or turn signals.


If all the lights work properly with the trailer wiring not connected then the truck itself is fine. If attaching the trailer wiring causes the lights to permanently stop working on the truck then you are blowing a fuse and it will need to be replaced. Your owners manual will show you where the fuse panel is. You should be able to check the wiring plug at the back of the truck to be sure it is working properly with a test light and a helper. If the power for signals/brakes etc are not all working at the plug, then trace back and fix these. If all is good at the truck's plug, then the trailer wiring must be faulty. Again, go through it and fix anything that is broken or corroded. Of course it goes without saying, make sure all the bulbs are good.

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Find the LEFT INSTRUMENT PANEL FUSE BLOCK. At the TURN SIGNAL/FLASHER MODULE, a 10A fuse (A9?) protects the right trailer stop/turn circuit (DK GRN) which you say is OK. Back at the S/FM, a 10A fuse (A8?) protects the LEFT trailer stop/turn circuit (YEL). At the UNDER HOOD FUSE BLOCK, a 15A TRL PARK fuse (B6?) protects the running/parking lights (BRN).

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I have a 2003 chevy hd duramax diesel, the right brake and turn signal work fine on the truck, but doesn't work on the trailer. I checked the right trailer stop and turn signal fuse and it is fine. I...


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I have a 2004 Chev Suburban and my trailer running lights do not work but the stop and singnal lights do. Can this be a fuse issue and if so what fuse runs the running lights?


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Trailer brakes


Take a 12 volt test light... the kind that has a spring loaded clip to hold the probe into the wire, and insert it into the wire just before the trailer plug, vehicle side. (Blue I think) If there is a connection, the brake should see it and you should have an indicator light. When you activate the brake the test light should lite up. If not, move up to the brake actuator and test the blue wire. If there is nothing at the actuator, check the black wire. It is power to the controller. If no power there, check fuses again. If it does pick it up at the plug, connect the trailer and test the trailer itself. First ground to the trailer and then to the truck. Most problems are ground wire related. Then move to the axle and test it there. For the brakes to work, and even show on the indicator, there has to be a ground and power to the brakes themselves. There are 2 wires to each brake... a ground and a power. Test across both wires to make sure you have power and ground. You can also hook another trailer to your truck or another truck to your trailer. Lights can work through trailer ball ground. Brakes can't. leave the trailer unhooked from the trailer and hook the wiring up and test the lights. That usually will indicate a good or faulty ground. Also make sure there is a GOOD ground to the truck frame/body. Also try http://www.etrailer.com/faq-wiring.aspx. They have a great website with lots of info. Hope this helps. Mike

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2 Answers

I only have taillights coming out of the trailer plug


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1 Answer

LEFT TRAILER TURN SIGNAL DOES NOT WORK


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LEFT TRAILER TURN SIGNAL DOES NOT WORK


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