Name is Mark, I work at a Speed Shop here in Columbus Ohio we have a D350 with a 1993 12v Cummins engine in it we use it as a shop truck I will attach a picture of it below looking for some information on troubleshooting some of the electrical issues we have on the truck. I'm not a cummins guy just stepped into the shop here as a General Manager. Would like to get the truck running for events coming up. Installed brand new battery won't crank, click or do any of the sorts. I have found a wiring diagram to sort through some of the wiring just looking to see if there is anything I should look for while trying to troubleshoot the problems.

Thanks in advanced