Hello all I have gone through pages and pages of threads and still can not find an answer. When I turn the key on my 92 H1 to start, the fuse in position 7B blows. does anyone have a 92 year electrical diagram? As I understand it power goes through the fuse to an oil pressure switch, then on to the fuel pump relay then on to the pump. This has been years in the process of fixing this. So far I have installed a NOS engine harness, as the previous owner hacked it to death. A new fuel pump and relay. A new oil pressure switch and a new glow plug relay. I am starting to get into the body harness looking for a short. So far it all looks good. What am I missing? Thank You

 

Call Dave Oberer at Hummerpartsguy.com. He can talk you through it and likely has any parts you will need.