I have a 91 dodge diesel and my headlights keep blowing out. First the high beam went out and then the low beams, I replaced them with new ones two days ago and already the high beams have gone out..... What should I check first.........Thanks

 

Headlight switch and then I would look into putting in relay's for the headlight's

 

hey-Hey!!!,
I think you cover only one possible failure with your suggestion, lack of power to the lights causing them to 'go out'. I think it will do no good if his voltage regulator is failing in charge mode and over voltage-ing things. In any case, with colder weather the regulators seem to get more symptomatic...mine is comming out as soon as I can get a replacement in hand.
cheers,
Douglas

 

Thank you for your information, this does seem like the results from to much voltage because I'm not losing power to the headlights something is burning them out. I'll change out the regulator and see how it goes........thanks

 

First thing to check is your battery voltage with a real voltmeter and see what it reads.

 

Voltage regulator gone wild would be my diagnosis.

 

My regulator went wild and I didn't lose my lights. It was showing about 17 volts. But I did stop and tap on the regulator and if it didn't release I would unplug it.

 

I want to thank everyone for your. help, I checked my battery voltage tonight and it read a little over 17 volts. I plan to replace my voltage regulator tomorrow so thank you once again this has really been alot of help.

 

well hope it work's and just remember Friend's don't let Friend;s drive Chevy's lol