Question about 2003 Chevrolet Silverado 2500HD
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
Posted on Oct 07, 2009
Pull the plug apart on the trailer. Check that all wire connections are tight with a screwdriver. If it is a 7 pin plug the the terminal marked blue will have the brake wire in it. If it is a 6 pin plug it will be either the pin marked S around the side or the center pin, again check for loose wires. you must have a good ground because the lights still work. Also check the wiring under the trailer and around the axles for wires that may have caught something and been disconnected
Posted on Mar 09, 2010
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Posted on Jan 02, 2017
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