Had headlight failure and put in 1 new headlight H6204 from Sylvania Silverrstar. The headlights only work on High Beam. Why? Could it be the dimmer switch? All other lights function correctly. Thank You Bill
I had this problem on my truck.
It turned out that the previous owner, who was dyslexic, mixed up the hot wire and the high beam wire at the dimmer switch.
I I turned on the headlights, power went directly to high beam terminal. When I pressed the floor button, it turned off the lights altogether.
There are three terminals on the dimmer switch. I don't remember exactly which is which but if the hi beam indicator comes on, you'll know which side is hi beam.
