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Old 06-06-2017, 12:42 PM   #1 (permalink)
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Default Headlight problem '86 Sammy JX

Drivers side headlight only works on high beam. Passenger side works on both. Cleaned all grounds I could find, even rear. Put meter on headlight and got about 10.5V. Shot contact cleaner into column switch. Pulled bulb and hooked it up to passenger side. Works perfect. Running out of ideas.....maybe its the column switch?????
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Old 06-06-2017, 01:46 PM   #2 (permalink)
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fordem will become famous soon enough

One light works properly, one doesn't - the problem is either the bulb or the wiring - you have eliminated the bulb, so that leaves the wiring.

As for the column switch - ask yourself this question - why would the one switch allow one bulb to work and not the other?

You put the meter on the headlight and got about 10.5 volts - what are we supposed to understand from that? There were three possible places on each headlamp you could measure the voltage - which one was it? Which headlight was it - the working one - or the non-working one? Was it with the lamp on or off?

10.5 volts would be considered low, but without knowing where the measurement was made, or under what circumstances, it really doesn't convey a whole lot of information - maybe your battery has a bad cell, maybe you have a lot of voltage drop in the wiring, maybe you have a burned connection and it's preventing current flow and that's why your lamp isn't lighting.

Samurai headlights are ground switched - there is a separately fused +12v feed to each headlight, white with blue on one side, white with red on the other - from the headlights there is a low beam connection (red with white) and a high beam connection (red), these go to the combination switch.

Pull both headlight bulbs and the measure the voltage on the white/blue & white/red wires - if you don't have 12V there, work back to the fuses and find & fix the problem - if you have 12V, reinstall the bulbs and check the voltages on the red & red/white wires - compare the readings on the working & non-working sides - when the lamps are lit the voltage on the red & red/white wires should be close to 0V.

I'm betting on a burned connection at one of the headlamp sockets.
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