Hey guys, I'm putting in a couple gauges, I need to know what wires are:
Switched 12V headlamp source (+)
Constant 12 volt source (+)
And a switched 12 volt source (+)
Vehicle ground (-)

I got my wire harnesses for the gauges fed in through the light / dimmer panel next to the steering wheel, I would be able to get that info my self, but I don't have my volt meter with me

 

 

dont kno any of those off hand do you have a test light ? you can use that to get your wires

 

I have one for A/C current, but I don't have a test light for D/C current

 

it might light up if u use it never tried that before

 

Nah I don't think it would work, the A/C test light picks up alternating current, if it's not alternating it will just read it as a dead circuit

 

What year is your truck?

 

The red/yellow wire gets hot when you turn on the headlight switch. If it does not then your headlight switch is bad.

Once you have power on the red/yellow wire at the multi-function switch the red/black should be hot when you turn them on low beam and the light green/black will get hot when you turn it on high beams. But you have to have power on the red/yellow wire and the multi-function switch hooked up for this to happen. Just hook your test light into the back side of the connector to test for which lead you want.

 

Thanks ibd2328, that helped out a lot, it's a 1998, 4.2L XL, I got it hooked up, just need to do the sensor's now!

 

Glad I could help. Looks good