Its only when the lights are on and am braking that the gages act up and wants to die.
Loose connection ? check all wires from battery, clean battery & terminals, check alternator wires, grounds, etc., thoroughly check all grounds, everywhere !!!!!!!! inspect the headlight switch for loose connection, trace all power wires & ground wires for loose or bad connection . what else could it be ?????????????/ check all wires, especially back to fuel pump, rear tail lights, etc., make sure those ground wires are making a good connection, DO YOU UNDERSTAND ??????? I CAN'T EXPRESS THIS ENOUGH !!!!!!
SOURCE: 2000 gmc jimmy brake lights
I had the same problem with my 2001. I found it was the multi function switch. Better known as your turn signal switch. I found that the hazard switch portion of it had shorted. replacement is fairly easy, aftermarket part is available, much cheaper than GM.
SOURCE: When i turn my lights on the right light and brake
The board where the tail-light bulbs plug in may have melted. Check it out !
SOURCE: i have a 1995 gmc sierra 2500 when i step on the
There is a vacuum leak in the vacuum hose system causing the problem. Verify all vacuum hoses. Especially the rubber parts connecting plastic hose to the joints. The high temperature causes these rubbers cracked no longer sealing properly with aging plastice hoses.
SOURCE: I have 2002 GMC van
This sounds like a bad ground, remove the brake light sockets and remove the bulbs, take a look at the sockets and see if the socket is burt or melting, the most common problem is the socket goes bad and cant handle the brake and park lights at the same time , this is cause by a bad ground inside the socket, try cleaning the contacts in the socket and gentle prying them out to make a better contact to the bulb, also make sure there are no burnt marks on the contact terminals on the bulbs, good day
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