so for about the past week my headlights have been working then the othernight i'm driving and nothing. brights work and when the low beams are on the fogs work. i can't seem to find a good schematic of the headlights either. i put a volt meter on the headlight connectors earlier and when they're "on" all three terminals show 12v. when i hit the high beams one of the terminals drops to like 5v. any suggestions or if someone has a good wiring diagram i would greatly appreciate it.
help me see at night please
- Thread starter 7mslider
- Start date
I think we have headlight relays. And we have a few fuses. I would recommend checking your fuses.
Or maybe you headlight switch on the column broke
Or maybe you headlight switch on the column broke
all the fuses are good, and i can hear the relay clicking when i turn on the headlights. i tried another relay that was know working and still nothing. i should mention that it did this before and then mysteriously started working again
i don't think that there is a break in the wire. i tested the connectors at the headlights themselves. when the switch is on, all three of the terminals are getting 12v. i cant make heads or tails of the wiring diagram that i have and i dont know what they should be at but they are all def getting power. like i said when i hit the high beams one of the terminals drop to around 5v and the highs work just fine
The Supra - like most japanese imports - use a switched ground system for the headlights, as opposed to domestics, that use a switched power system. So looking for power on the headlight terminals is going to be less than effective in most cases. 
As you've learned, you need to look for ground continuity instead.
As you've learned, you need to look for ground continuity instead.