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
- thebax2006Lv 76 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.
- Anonymous6 months ago
So the high beams are not switching off. Sounds like a relay. Or elsea short. Always look for corrosion bridges.