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Check to see if the vehicle has trailer wiring. You may need to get down and look closely under the back bumper area. Or maybe in the trunk area. Let me know one way or the other.
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You have the feed wire (HOT WIRE) feeding to a ground, causing fuse to blow. Have wires checked from brake switch to tail lights. Also, possible bad brake switch shorting out. Hope this helps.
Both. If the running lights ( marker, tail, clearence, or parking) and brake lights are out since the rain, a tail light assembly is broken and filling with water enough to create a short to ground. If there's no broken lens, whitch normally only blows the bulb. Then, the problem lyes in the trailer light harness. the brown wire (tail) & green wire (left turn/brake or yellow wire (right turn/brake) must be bare exsposed that shorts to ground when wet. all the trailer wires could be smashed together damaged the plastic coating on them. no problem till water shorts to ground. The white wire is the ground wire make its not able to touch the other 3 wires or bare & wet. Tape wires seperate then replace tail/mkr fuse and brake fuse. That should do it.
you obviously have a short to ground on one of the wires to the back (if it was the front the brake shouldn't blow the fuse). the most common problem is usually in a trailer light harness. if you look under the drivers side rear of the truck, down under the tail light there will be a plugin junction. pull this plug-in apart and see if the fuse still blows. if it does then the problem is forward of that connector, if it doesn't then the problem is behind that plugin. be sure to check for "green death" (electrical corrosion) at all joints especially any trailer hook ups.
If the fuse is blowing out it means you have a short cirtuit.possible causes the Light socket, pedal sensor or somewhere along the wiring harness Aires might na chewed you and touching each other
I HAD A SIMILAR PROBLEM ONCE AND ALL IT WAS, WAS THE CONECTION IN THE TAIL WAS CORRODED AND IT TOOK SOME CLEANING BUT I CHECKED FOR RELAYS AND ALL FUSES FIRST
No interior dash lights and no tail lights on a GM usually means it's time for a new headlight switch. To check the fuse, it's in the middle of the fuse box marked instrument cluster. If the fuse is good, buy the switch. Lights blowing fuses means you either have a bare wire running down the driver's side of the truck or up into the tail light assemblies. There is also a plug in under the box on the driver's side near the bumper that may be getting wet. Hope this helps.
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