whenindoubtuseahammer

I finally got it to start. It was a mix of a few issues. The frame ground was in bad shape so I ran a new one and cleaned up the area to get a good connection then covered it in rust reformer then bed liner to keep it as clean as possible. The other ground I found that looked suspect was on the frame toward the back of the truck near the bed. I did the same. After pulling the fuse box out from the engine bay I found a couple of wires that looked like at some point mice may have got ahold of it. That was an easy fix. After that i was able to get control power and was able to trace down a few more connections going to the other fuse panels in the cab. After that it finally started up and runs. It sounds like an angry school bus which I can work with. No OBD2 codes, but I think since its set for a long time I should pull the turbo and get it rebuilt or swapped out, but for now im good to go. Thanks for all the advice. It got me on the right track.

It get absolutely nothing. No chimes, no dash lights, it won’t crank. It’s completely dead outside of the obd2 port which is throwing no codes. I’m wondering outside of a rusty ground somewhere if it could be a connection on one of the fuse blocks? I would not be surprised if water could get under the main panel under the hood on the drivers side.

Nothing comes up when I run my scanner on it. It’s hasp power but it’s not wanting to pull any data. I’ll check the ground connections they very well could have some rust I need to clean up to make the connection.

Good evening. I was lucky enough to get passed down to me a 2007 GMC LBZ that was my great uncle's. While the underside and rockers are more or less gone I feel like with time I can restore it to working order since it only has 110,000 miles and he put nearly every option he could get without getting the new body style since he did not trust DEF. So far I have done everything I can think of but when I put the key into the ignition nothing happens. I put 2 brand new batteries in it. Cleaned the terminals. Check all the fuses and relays and they all pass with my multimeter. I know I'm missing something that I just cant think of. The only odd thing is the OBD2 port works which makes me think its not the mega fuse. Any advice would be greatly appreciated.