I have a 2000 gmc jimmy, 4.3l, automatic, push button 4wd.. I have searched the forum for the past 2 days and have not found anything to help me as of yet and was wondering if anyone had a wiring diagram of the 4wd system. I have only had the jimmy for a week and dont know much about it. the problem that I am having is that I did not have any lights on my 4x4 push button selectors and found that the atc fuse was blown I replaced it and everything worked perfect for about an hour then the atc fuse blew again I replaced it with the same results flawless operation went into every selection with now problems for only for another hour I thought that the 15 amp fuse that I had was just to small for the amperage so I looked and I had a few 30 amp fuses lying around I put the 30 in and instant blown fuse I pulled out the multi and checked the fuse recepticle for voltage and I have 12.46 at the hot side Ok normal. I checked the other side to see if it was grounded and yes it could be used for ground all day I have cleaned terminals and no change. so I was wondering if someone had a diagram that I could see wich wire or wirs are ran from the atc fuse from start to finish to see what all I need to check or to see if I can bypass that whole circuit and run a new one.

Thank you for any help

Sam

 

well, I found the diagram that i was looking for and ran a new harness for the all the time power circuit and I have my 4wd back and everything is working except 4lo it just blinks as of now I will try to see if I can resolve this but auto 4wd and 4hi and 2hi are all working great at the moment I hope it stays that way and after I get everything working like it supose to I will give a detailed description with pics.

 

well i have 4lo working, i had to let the jimmy roll real slow in neutral and it goes into 4lo i have to do the same thing to get it back out of 4lo everything is working fine so far except a clunk noise when it goes into 4lo and it is now hard to start when cold will post pics as soon as i can get my camera to work

 

I have the exact same problem right now, I keep blowing my ATC fuse everytime I select 4wd. Where is that all the time power circuit harness located you replaced?