Question about 2002 Chevrolet Express

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Running lights do not work. I have no power coming to them. When I attach trailer lights I press the brake and the dash lights go off.

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Sounds like the person who wired up your trailer harness crossed the wrong two wires

Posted on Sep 12, 2010

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I'm trying to wire my 89 jeep wrangler to be towed useing it's existing lights.the turn signals both flash when right or left is on? I've tryed it under the dash with no luck now all the way...


If the brake and turn signal are on the same bulb than you can Orin straight wiring. If the brake and turn signal are on different bulbs than you'll need a wiring harness with a converter box. I'm pretty sure the wrangler has the brake and turn signal on the Same bulb so let's start with basic trailer wiring. The green wire on the trailer harness is for the right side turn and brake for the trailer. This wire should be attached to the wire on the vehicle that supplies power to the right turn signal/ brake light. The yellow wire is the left turn signal, brake light on the trailer and should be attached to the wire on the vehicle that supplies power to the left turn signal /brake light. The brown wire is the tail lights on the trailer and should be attached to either the left or right side wire on the vehicle that supplies power to the tail lights. The white wire is grounD and it is vitally important that this wire be attached to the vehicle in a manor that supplies a good ground. Failure to suppy a good ground will result in all kinds of funky problems with the trailerer lighting such as all the lights linking when the tail lights and turn signals are on at the same time. If you have any specific questions I will be more than happy to try and help. Good luck.

Jun 29, 2011 | Jeep Wrangler Cars & Trucks

1 Answer

I purchased a trailer that did not have any wiring on it what-so-ever. I purchased all of the required parts (i.e. trailer flat four wiring harness, new trailer lights). I wired the trailer with the...


When this happens it is usually a bad earth on the trailer.But hey,check the car also.Check inside the trailer lights for a bad connection.It is an earthing problem.Mate.I hope this helps.

Nov 02, 2009 | 2008 Jeep Wrangler

2 Answers

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

Sep 30, 2009 | 2003 Chevrolet Silverado 2500HD

1 Answer

98 Jeep Cherokee Classic No Hazards or Signals


Did you use a wiring adapter? this plugs into the stock system to properly power the trailer lights. the other thing is you could have a short to ground in the trailer wiring, especially where it comes out under the jeep.

Jun 13, 2009 | 1998 Jeep Cherokee

2 Answers

Right side trailer brake light does not work


Did yo check the fuse panel inside the truck its located on the drivers side dash , you have to open the driver side door, in there is a 10 amp fuse that is linked to rt trailer brakes and rt turn signal for the trailer, if the fuse is good there is a black box under the dash located on the floor on the driver side, just to the left of the break, thats where must of the plug in wire harness is for the trailer breaks!

May 31, 2009 | 2005 Chevrolet Silverado

2 Answers

Pressing brake causing blinker issue


The trailer harness that was installed probably has a short inside the box that distributes power to the trailer pig-tail. Remove the trailer harness. You problem will be cured.

Jan 27, 2009 | 1999 Toyota 4Runner

3 Answers

Trailer wiring for 06 GMC Canyon 4x4


exactly what does it do? please explain what happens when you press the brake turn on the light than brake signals ect.....

Aug 13, 2008 | 2006 GMC Canyon

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