OK, so I'm working on my headlights again, long story short I have no dims, no front marker lights, and only one headlight works on brights. Replaced dimmer switch and headlight switch today, no go on either.
I decided to check the headlight sockets with my meter, on the passenger side I have 12v on brights, nothing at all on dims. Pass. marker light no current at all. Both blinkers work, but the pass. one is dim, only powers up to 6v on blink.
Here's the kicker, and danged if I can understand it: Driver's side headlight socket reads -11v on brights, nothing on dims. No typo, that's NEGATIVE 11 volts. I don't understand, I don't think I've ever seen negative volts on a car. Does this mean there's a short? Although I can't understand how there could be one, power for the pass. light comes from the driver's side from what I can tell, no?
I thought maybe it was my relay, haven't checked it yet but it's on the inside of the radiator support, and that wouldn't explain why the marker lights have no power, as they don't go thru the relay.
I really need some help understanding this, I have to drive the truck 700-plus miles on Wednesday, and I'd love to have headlights before I go.
Thanks,
Tony
