My trailer brake lights on my 2001 suburban 2500 work when the truck is not running but when the truck is running they will not work. All other trailer lights work including the blinkers which is the same wire and same connection on the wiring harness. When you hit the brakes while it is running the lights go out when u let off the trailer taillights come back on. All lights work correctly on vehicle as well. The other day the abs motor would not turn off after cutting ignition off so I unplugged the and motor. Would this cause the trailer brake light issue?

SOURCE: no brake or turn signals the fuse blows

what about the sockets of the lights are they rusted in the contact spot and touching the 2 positive connections

SOURCE: Chevy S10 Tail Light issue

CHEVY S-10 TAIL LIGHTS PROBLEM RESOLVED...It seems Chevy engineered a ground shorting clip located under the left rear bumper area. It looks like a connector for trailer wiring harness, but in actuallity is a metal shorting clip which ties 5 wires together. They are all the ground wires for the tail lights. Then one single small wire runs to ground completeing the circuit. Problem is that this one wire is not tough enough to be a strain relief for the grounding plug and over time the ground wire wears, leaving intermittent lighting problems. FIX IS TO SPLICE THE GROUND WIRE INTO ONE OF THE FIVE OTHER WIRES AND USE PLASTIC TY WRAP FOR STRAIN RELIEF. This fixes no tail lights, intermittent rear signals, and other significant problems. I just got done making this same repair on a 2000 s-10 and everything works fine. Since it is the strain on the single ground wire connected to the connector that leads to failure, it is best to tie a new ground or clip the ground wire coming out of the plug and resplice it into one of the other five wires. Does not matter which one since electrically it makes no difference; they are all gound wires. BUT only one wire completes the connection and that is the problem. Really good engineering Chevy! The location is under left rear of bed in wiring harness right before the split. The connector is blue or green. Take the cover off to see the metal shorting clip. Also note the ground wire coming out of the plug/connector and runs about 8 inches to frame. If this is not hooked up you will have tail light issues. If you register on Autozone .com you can access wiring schematics for free. BL

SOURCE: 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!

SOURCE: 98 chevrolet silverado k2500 4x4 left rear brake light not workin

I have the full wiring harness for the exterior lights if you need it. Send me a email with a link to this posting and I will send you the diagram. [email protected]

SOURCE: trailer wiring

Have you checked the fuse box under the hood? There are seperate fuses for the truck lights and the trailer lights. If the fuses look good use a 12 volt test light to check for power on the turn signal pins when the brake is pushed. The brake lights and turn signals use the same wires to work. Power here would indicate the wiring and fuses on the truck is all good, meaning the trouble is on the trailer. Check the bulbs to be sure they are the correct ones, they should be dual element bulbs. Make sure you have a good ground on the trailer, usually the white wire in the 4 way plug is grounded to the trailer frame, do not depend on the trailer ball to be the ground, this is asking for trouble.