Anyone have an electrical schematic for a 6.5L diesel/99 Suburban?
 

I’m slowly unwinding all the electrical changes made to my 99 Suburban 6.5L diesel that was formerly operated by a municipal fire department.

This relay appears spliced into an engine harness bundle at one end and the passenger side battery at the other end (red wire with an in-line fuse). The truck dies if this wire is removed at the battery. At the harness end it looks like a red harness wire was cut and spliced to the blue and yellow wires from the relay.

Does anyone have an electrical schematic for a 6.5L diesel that will help me ID the cut red wire on the harness?

Re: Anyone have an electrical schematic for a 6.5L diesel/99 Suburban?
 

It's for the pickups but should be the same.

https://www.dieselplace.com/threads/.../#post-7237850

Re: Anyone have an electrical schematic for a 6.5L diesel/99 Suburban?
 

That’s a great resource. Thank you.