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'69 Headlight issues - low beam problem

Old Jul 29, 2020 | 10:44 PM
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Default '69 Headlight issues - low beam problem

When my low beams are on, only the single outboard LH headlight comes on.

When my high beams are on, all four headlights come on.

Is there a high and low beam filament in the outboard bulbs? If that is the case I'm wondering if the RH low beam filament has failed?

Or I was thinking maybe the high beam floor mounted switch may be broken?

I have jiggled/removed/re-installed all four headlamp bulb connections and it made no difference.

Thanks for your help! Mike
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Old Jul 29, 2020 | 11:06 PM
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Yes there are high beam filaments in the outer lights.

iF THE BULB IS GOOD :

Put in a Relay and rewire the headlights. They will be brighter and work better.

Or you can trace the wire and find the break .

Last edited by BLUE1972; Jul 30, 2020 at 08:01 AM.
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Old Jul 29, 2020 | 11:41 PM
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It's probaby the bulb - I had that issue but in reverse. On mine, the low beam worked but not the high beam. Replaced the bulb and it worked fine.
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Old Jul 30, 2020 | 06:25 AM
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I would suspect the bulb over the wiring, Take out the bad bulb and put it on the bench, then take a meter and look for power on the wires, or take the working bulb and swap it to the suspect wiring and see if it works....
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Old Jul 30, 2020 | 08:13 AM
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That is exactly how they are supposed to work: Outer low-beam lamps for normal driving; all four lamps when hi-beams are selected. Outer bulbs have hi and lo beam filaments; inners are only hi beam filament lamps.
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Old Jul 30, 2020 | 01:44 PM
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Thanks guys. It was just the bulb!
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