Question about 1999 Chevrolet Lumina

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Head lights one works other not then other works and then not

Ok this is a strange one, left head light is on the right one is not . Next time the right one is on and the left one is not. Both new bulbs the relays are new and there is power to both headlights but not at the same time. This just started. No new wiring done are any type of flashing relays. Any one got any ideas. has me stumped.

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You may need a wiring diagram to troubleshoot this. In past years the headlights were grounded at the light and the headlight switch provided power.
On your car, the headlights get power from a fuse for each side. The body computer, headlight switch, and dimmer switch all provide the ground for each side. The relays are grounded by the body computer and headlight switch.
If you have power at both headlights at the same time, I would say the problem is in the dimmer switch, the body computer, or the wiring. Somewhere a ground connection is failing.

Posted on Apr 22, 2013


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