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Discussion Starter · #1 ·
Think I know what is wrong, not my car. Drivers side on low beam glowing very low level.

Sketched diagram of likely issue. filament #1 is low beam, #3 is high beam. Gray line is grounded at the HL switch.
Red is hot at all times, fuse by the battery. Purple is backfeed. Three filaments in series.
Likely fuse blown, bad connection, wire broken.
My will look at it when daylight and warmer.

Any comments?
 

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You could use a multi meter and test the voltage getting to the light and see what it reads. Also test the resistance on the ground wire, it should be as small as possible.

If the light is working but very low it most likely is not a fuse, the fuse is working or not type of thing.

My guess would be a bad ground connection, or possibly a bad wire with high resistance.

Check your ground connections and than test the power wire resistance to headlight and same for the ground connection.
 
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