Rex3

Thanks Richard, that's exactly what I'm going to do. Stopped at the junk yard after work and cut the harness out. Thanks for the reply.

Working on the headlights on my 99 gmc, plow was removed along with the wiring harness (wires cut). Question is it looks like the low and high beam have 2 wires each on the connector but there are 5 wires in the oem harness that is cut. I have the schematic but not very good with electrical. Anyone have a picture of how these wires should be wired to the connecors? Would it be better to get a used harness from a junkyard? Thanks

I will give that a try. I did have an error on the abs side, bad wheel speed sensor i changed that and cleared the codes and so far so good. I thought I read if there was an error on the abs it could case issues with the 4wd, was hoping that this was the case but it wasn't. I like the auto mode for winter driving. Thanks for your insight.

I was on dry hard surface and put it 4auto and front axle was binding like it was in 4hi. I had a 1999 Tahoe and used the 4 auto and never felt like that.

Yes that's exactly whats going on.

Hello, I have a 1999 sierra, when I put it in auto 4wd it acts like it is in 4hi. I do not have any cel, or service lights on. All the lights on the push button 4wd switch work. Any idea where I need to start looking as to why it is doing this. Thanks in advance and thanks for the add to the group.