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Why does the brake lights go off when you turn on your headlights on your 97 gmc van?
Wiki User
∙ 12y ago
Troubleshooting 1997 GMC Van brake light / headlight issue (check in this order):
· Check Fuses
· Check Bulbs
· Check Relay(s)
· Check Light Switch(es)
· Check license plate light bulb and wiring
· Check trailer hitch wiring harness
· Check all wiring harnesses and wire
Most likely its the fuse or a burnt bulb breaking the circuit. Sometimes the license plate and/or the trailer hitch is wired into other circuits and can cause issues in other areas. Sometimes its wires grounding out somewhere on the vehicle. See sources and related links below for bulb information. See owner's manual for location and identification of fuses.
Wiki User
∙ 12y ago
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