Tip & How-To about Chevrolet Suburban 1500

Trailer light connections

I have had many people ask about trailer light connection problem and the biggest one I have had to answer is.( When connected and the lights turned on than with the brake is depressed the trailer lights shut off. What causes this?)
The answer to this is simple. You have a bad ground problem between your vehicle and the trailer. This can be solved by looking at your trailer wire connection plug. Fray a little bit of the white wire on the plug. some place easy where you can wrap it with electrical tape when you get done. Take another wire and connect it to the frayed part of the wire. once this is done take the wire and connect it to a part of the trailer that is free of debree,rust,corrosion and some place that will not be subject to coming off or broken. Once this is done turn your lights on and depress the brake. If your lights do not go off than permamantly attach the wire to that location and wrap the wire at were you have frayed it.

If this does not fix the problem than look at the connection on the vehicle. Once again take another wire and connect it to a frayed point on the white wire of the vehicle. find a spot on the vehicle to connect the wire to. than try your lights again. This should work in all the cases i have had to deal with. if it does not feel free to contact me and i would be glad to help you at any time.

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2 Answers

lost all elec.power to trailer plug on jeep


The trailer connection is usually fed off the wiring from the brake and tail lights If those work, my guess is the wire that goes to ground is open. try following the harness back toward the tail and brake lights looking for broken or corroded connections. If you have a meter or 12v test light try connecting the one end to a good ground if using a meter it should be the black or negative lead. Turn on the running lights and one turn signal while probing the plug if you get voltage or the light to light you have an open ground. Locate and repair the connection.

Aug 07, 2014 | 2010 Jeep Liberty

1 Answer

I have a 1996 Chevy Calarado when I hook up my trailer I have break light,turn signals, flashers. but no running lights I checked the ground wire, replaced the ground connection to the trailer frame and still no running lights! Now what?


If the other lights work on the trailer, it won;t be the earth return. Probably you have not wired the car connection to the same key as the trailer and your running lights are connected to pin 5 or the aux pin.

Apr 19, 2010 | 2008 Chevrolet Equinox

1 Answer

Trailer break lights and running lights don't work


i would use a multimeter to read each wires operation voltage before hooking up. ex. turn on turn signal, connect meter to find which wires is pulsing.

So your saying you wired the trailer yourself? yes you need the wires to both sides for brake and running. the runners have to be all connected, and the brake all connected, hot and neutral.

Mar 17, 2009 | 2002 Oldsmobile Alero

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