Having problems with your 1991 Toyota Pickup ?
One head light is on and the other is off,when nyou dim them the opposite light is on and the other is off? i changed the bulbs and the fuses are good.
You may have a bad ground. Trace the white wiuth a black wire at the headlamps, and endure that the wires are solidly and properly grounded. Start at the connector, and work your way back.
Repair Help & Product Troubleshooting for 1991 Toyota Pickup
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