Question about 2002 Chevrolet Express

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I have a 2002 Chevy Express van that is wired for 7 prong trailer brakes. I started to replace the 7 prong plug and now I can't get the brake lights to shut off. I have read something about resetting a CHMSL relay needing to be reset. Does this make sense? I have don't nothing to the existing wiring of the van just trying to replace this 7 prong plug.

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Try this site. Bottom of the page gives color codes for each vehicle. http://www.etrailer.com/faq-wiring.aspx. Sounds like crossed wires.

Posted on Jun 23, 2011

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Posted on Jan 02, 2017

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We have a 2005 chevy express cargo van. We are looking for a plug to hook up the lights for a trailer is there wiring plug alreay set up somewhere in the back somewhere.


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I have a b 2200 mazda pick up. i recently put on a 7 prong plug to pull a small boat trailor and when hooking up wires i have a seperate brake wire and dont know were it goes. i tried to hook it to the...


the wire you maybe talking about could posibly be for the trailer brake controller, which you have to buy serperate i'm not to sure how much it will run you but i would look into that because that is what the extra wire is usually forwith the 7 prong trailer plugs

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Hey Paul, it's most likely a wiring problem. There is one wire designated for just the running lights. What type of plug does the truck have? Probably 6 or 7 way (6 or 7 wire). You can check the plug-in at the truck with a multi-meter to see if there's power at that point. If there is, then the problem is somewhere from the trailer plug to the lights on the trailer. If you have a 7 way plug, the center plug is for aux. power (back up lights on what you pull, if equipped). One wire is power to the camper battery for a breakaway switch, one for left turn and stop, one for right turn and stop, a ground wire, one for running lights, and one for trailer brakes. To determine what wire does what, 1st with meter check volts of all wires w/ truck and trailer hooked up, truck running, power wire to battery for breakaway should show voltage if equipped w/ a trickle charge, brake wire will show low voltage, approx. 2 volts, apply brakes and should go up to approx. 12 volts, put on L turn signal, meter should go up and down, as power to blinker pulses on and off, do the same to determine which is the R turn signal (put foot on truck brakes will show voltage to brake lights AND brakes, continue w/ process of elimination to determine which is running lights, and exactly where power is not going.

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