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1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck
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Old Nov 15, 2019 | 08:11 PM
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From: The Shenandoah Valley
Originally Posted by applebaggins
My apologies. When I pull the switch on the dash, the headlights turn on. The driver side is normal, but the passenger side headlight is stuck on high-beam. I hit the switch on the floor and there is no change. I push the switch on the dash and the lights turn out. Basically, the lights are perpetually stuck with driver side on regular brightness and passenger side stuck on high-beam.

I don't recall seeing an indicator light on the dash at all.
Pull the passenger headlight out and use a jumper from the ground terminal to a good ground and then try it. Might need to have a helper do the switch end while you hold a grounded probe to terminal on back of headlight. Just sounds to me like a bad ground on that passenger side. Sometimes a dual filament bulb with two hot wires and a bad ground will find a ground back through the other side or filament to system.

Try it.

Then, if it seems to be the issue, likely just a matter of needing a new plug spliced in … if the fault is in the plug itself which is likely.
 
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