Keep Burning Out Headlights

[Jim68]

Alright. A few nights ago I was driving and my lights both flashed kinda blue and went out. So the next night I bought a new halogen one from autozone and put it in and it works for a while but as I'm leaving church a little later I come out of the driveway and hit a little bump and the new one did the same thing. I replaced the voltage regulator and checked the grounds on the front wiring harness thinking maybe they were getting too hot and making the filaments brittle so just a little bump would break them. well tonight after I replaced them again, guess what? same problem. Burnt out on the way home. HELP. anything. thanks guys.
James

[GMCPaul]

You mention checking the ground wires, did you check to see if you have a ground strap going from the passenger side of frame to the inner fender or core support? With the core support sitting on rubber mounting cushions it insulates it, and in order for the front lighting to have good ground GM used a ground strap.
What does the AMP guage read? Not overcharging are you?
GMCPaul

[Longhorn Man]

If you don't have the ground strap paul is refering too, any 10 guage wire should do it. I prefer going straight from the neg term to the core, or straight from the ground cable where it goes to the engine to the core. This way, you are getting the best possable ground.

[RON WOODGEARD]

I agree with Paul on this one,,,, Some way or the other you're getting a "voltage Spike". That's what you described with the increase of lights and then blowing the filaments out. Now of course is finding out WHY.....Wished I had an answer for you. But as both Paul and Andy said, Start with the ground. Still it makes you wonder why it hasn't happened before now.

RON

[gangforward]

I had this same problem at one time. Did all you've outlined here, and still had the same problem. Eventually I found that the alternator was bad and was spiking so much voltage it would burn out the headlights. I replaced the Alternator, and the problem was solved.