Hey guys, I'm new to the forum but found a lot of posts helpful so I thought I'd ask a question. I bought some 35watt HID's(hi/lo) for my 92' toyota pickup v6. I installed these lights roughly a month ago and they've been great ever since. But on my way home on lunch the other day I noticed they wouldn't turn on, running lights/blinkers all worked but no headlights. Then after trying to find the problem I noticed my running lights no longer worked either. blinkers worked though. So after researching it, I replaced my headlight combo switch and then my running lights worked again but still no headlights. Slapped in the regular headlight bulbs and took out the HID's and everything works great. I want to put in replacement HID's but I'm afraid I'm going to have to replace the switch again if it blows! Anyone know what might be going on? Sorry for such a long post.

 

Sure the ballasts aren't bad for the HIDs?

I would HIGHLY recommend bypassing the factory wiring:
http://www.4crawler.com/4x4/CheapTri...adlights.shtml

 

that link you posted is very helpful. It talks all about the switched ground and HID problem. Thanks. I'll test my wire voltage tomorrow and see how much the harness costs. makes sense now. Thanks man.

 

are your using a relay harness ?

 

I run 35watt HID's in my 90 4runner with no relay or bypass or anything, just the stock headlight harness. Never had a problem with burning anything out. I would definitely check out the HID's quality. Those bad boys might be sucking way to many amps out when they start up.

 

If the combo switch was going out to begin with, the resistance through the switch could've resulted in lower voltage to the ballasts and the excessive current draw could cause them to burn out. I've seen bad light switches do the same to fluorescent light ballasts in the home.