I have a 1999 4x4 gmc sierra 4.8L V8. I just installed a new stereo and it works fine. The dash, however, is a little goofy. The gear indicator on the dash was dimming when the stereo was turned up. I fixed that by moving the ground to the right spot on the radio wiring harness. I do have another problem though; the dash boards back lights arn't getting power. I tried all the fuses, there is no illumination wire to the stereo, the bulbs are good, and i havn't seen any relays for it. I know the dimmer switch does work, because when I turn it up all the way, the interior light comes on. I've been searching online for weeks now and have yet to find an answer. Please help

SOURCE: Fog Lights won't work

Definitely a ground. Clean everything with light sandpaper. Follow any/all wires and see where it grounds, clean there too. If all else fails, run a new ground wire from the frame to the exact spot you got the bulbs to work (a workaround that usually remains permanent on my cars!).

Ned C Cook

• 3433 Answers
• Posted on May 28, 2009

SOURCE: fog lights not turning on

Sounds good to me except, the switch light shout be on the relay primary circiut and light off until you turn it on. When you turn the switch on, it lights up and energizes the relay, the relay closes and completes the secondary circiut for ythe fog lights. VIOLA' I have a silverado. done deal thanks

SOURCE: I have a 2002 GMC sierra 1500. Instrument Lights Not Working

When dash lights don't work odds are the tail lights don't work either.Sounds like Dimmer switch may be a problem.

SOURCE: fog lights on 2002 gmc

GET A TESTER. LOOKS LIKE A SCREW DRIVER BUT HAS A LIGHT AND GATOR CLIP. AND TEST THE SOCKET.

Colin Stickland

• 22516 Answers
• Posted on Nov 07, 2009

SOURCE: I have a 2000 gmc sierra. I have no dash lights

a connector plug has corroded pins or a broken printed circuit on the back of the speedo head