Turn on switch, no pop up and no headlights even turn on. have high beams and running lights.
If you can verify current going out of the main dash switch towards the headlamps, then I would go relay hunting. My guess is the switch, since the brights and fog lamps work on demand (dimmer switch pulled).
Im still trying to find wiring diagram for headlight circuit but with no luck. the dimmer is in the dash not on the turn switch. when I test at light/motor connector on front frame rail the three wires going to headlight have no positive power but its reading they are all grounds. with switch on or off I have nothing. the relays are clicking on the passenger side floorboard but once again no diagram to test those. fuses are good in engine compartment. who knows, maybe I need a can of gas and a lighter
We do not have wiring diagrams due to GM copyright law protection. You can however access the factory repair manuals here for a yearly subscription fee of about $40.00 I am told.. www.alldatadiy.com
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SOURCE: 1997 Chevrolet Headlight problem
We had the same exact symptoms right down to the clicking noise under the dash. A friend who is a mechanic provided all the wiring diagrams, etc and when we pulled the dash we found that there was another enclosure behind the dash.....we stopped there.......
....waited a few days, did some research and decided since a replacement headlight switch was about $50.00 the easiest route was to to swap that out hoping it would fix the problem....was also a very easy installation.
Turns out that fixed the problem. Good luck!!!
SOURCE: CHEVY 1500 TRUCK HEADLIGHTS TURN OFF WHEN YOU TURN ON SWITCH
If you have replaced the switch, and it is still doing it it sounds like you definately have a short somewhere in your wiring. On the other hand if the dimmer is in the turn signal arm ( forward bright back dim ) the problem could also be there in the dimmer switch, such as a short being caused by that dimmer switch being faulty.Auto Zone and Discount Auto Parts both test a lot of your electrical problems for free, and/or may have some knowledge to more accurately pin point the problem. Not sure about Pep Boys or some of the other discount auto part chains.
SOURCE: Headlights wont work on 2000
Check the fusible links under the hood. Also, double check the bulbs are in fact good. Lastly it could be a defective daytime running light relay.
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