What would cause both my low beam headlights not to turn on, on my 1977 toyota pickup, but they turn on when I switch to high beams?

It s a quad headlight set up. Inner bulbs are the high beams whiles the outter 2 are the lowbeams. I recently bought the truck and both low beams only turn on alongside the high beams,not by themselves

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  • 5 months ago

    Sounds to me as if the outer bulbs are the high beams.

    Take the harness connector off both bulbs on one side and see if they both have 2 terminal connectors. If one has 3 terminals it's the low beam connector.

    If they both have 2 terminals swap the headlights.

  • Anonymous
    5 months ago

    So the high beams are not switching off. Sounds like a relay. Or elsea short. Always look for corrosion bridges.

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