97 Blazer Headlight Issues

That could be the main switch OR the dimmer in the column. I would pull the trim and bypass the main switch and see what you get then. If you have all the lights and they switch beams it is the main switch. If not it's the multifunction switch in the column.

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H\What do you mean dimmer on the column? The dimmer control it to the right of the light switch on my vehicle.

No, the headlight control is INSIDE the multifunction switch inside the steering column. That is the switch that changes from high to low beam when you pull the lever. If it fails the power to both high and low beam relays is lost and you have only the DRLs which do not pass through the switch. The control you are looking at dims the dash display and turns on the interior light if rotated far enough.

====================== Ohhh! OK gotcha. Well if it is that it sounds like a bite to get into! Have you see any online guides to tearing into the column? Never done that. Do you think it could be either or, the dbl headlight switch on the dash or the one on the column your talking about? I know when it started failing I could turn the headlight off and on and it would work right for a while so I figure it was that switch or I was clicking a relay somewhere. Never really use the high-beams but I do have tilt wheel I use daily.

Thank again for your post!

That is the problem. It could be either one. The main switch on the dash runs power to the lights, The switch inside the column grounds the relays that select which beam your lights are on, if the ground contact in it fails neither set of lights will operate. So if you were to bypass the main switch (or get one from a salvage yard for testing use) and you still have no lights then it points to the switch in the column. Also make sure the main ground in the front for the lights themselves hasn't rusted off. Usually that will not cause all the lights to shut off though.

John wrote: > > ======================

That is the problem. It could be either one. The main switch on the dash runs power to the lights, The switch inside the column grounds the relays that select which beam your lights are on, if the ground contact in it fails neither set of lights will operate. So if you were to bypass the main switch (or get one from a salvage yard for testing use) and you still have no lights then it points to the switch in the column. Also make sure the main ground in the front for the lights themselves hasn't rusted off. Usually that will not cause all the lights to shut off though. ========================================================= OK, I only thought it fair to tell u guy who helped what the issue ended up being. The issue was the headlight switch on the dash. It seems that there is some kind of thin metal tab, maybe a thermal link or sorts that seemed to have gotten weak. I pick up a new switch at the dealer ($45) and all seem OK.

Thanks again for all that weighed in

THE END (I hope) LOL