it worked , thanks . You wouldn't happen to know anything about the 4 wheel drive on my colorado alsoLet us know if that works for you. I haven't looked at a wiring diagram to see where the headlight ground is, but there's one available here on the site. I feel quite certain that the passenger side ground is probably your best place to start though.
My problem is that the lights on the dash will not light up. So it will not do anything.When I bought my '04 Colorado, the 4x4 didn't work. With the driver's door open, I would press the button to go into 4x4 and I could hear stuff happening under the truck. Something would shift in and out as I pressed the 2x4 and 4x4 buttons. Since I felt pretty sure the transfer case was doing what it was supposed to do, I picked up a front axle actuator from a u-pull lot here in town and that did the trick. Basically, the transfer case makes the front driveshaft turn and the front differential operate. But, if the front axle actuator doesn't activate, the front wheels still just spin free.
This will help:You can screw this part out and connect the wire and try shifting into 4x4 and see if the plunger comes out. If it doesn't, that's your problem. They're somewhat universal and I got mine off of a Tahoe 4x4 at the U-pull yard. The price for a new one is abut $80, so I didn't want to buy one without knowing if that was the problem. It's easy to test though.