1994 GMC Sonoma Repair Question
GMC Sonoma Dimmer switch Problem
Inside the head light switch is a circuit breaker that where you get the flickering,you have a short from the headlamp switch to the head lamp dimmer switch (the dimmer is high and low switch),Follow the wire leading to the dimmer switch there is a short in there
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Sounds like there's a bad ground for the rear lights. One way to verify it is by turning on the left turn signal with the headlights off, then watch what happens on the rear. If you see the right side flashing too, remove the bulbs on the right and the left one will go off.
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