88 Suburban wiring harness question

[DaveB]

On my commando project I have used an 88 suburban wiring harness. The engine compartment harness is mostly stock except where I converted it to CJ lights. The interior harness had most of the accessories taken off and I may have taken off too many things. I am not getting power to the BATT circuits (those tied to the alternator). On my old 85 K30 the alternator is tied to the starter battery + through a fuse link wire. On the 88 and 87 harnesses there isn't a wire from the alternator to the starter. The alternator wire goes to the fuse block on the fire wall where it must pick up the battery +12V. There is a fuse link wire that goes from the starter to the fuse block but it only drives some of the fuse block. I am guessing that there must be a jumper or fuse that spans the two sections of the fuse block. I can add a fuse link to the harness and take care of it but how do they do it in stock form ?

 

[Tacoma]

I just so happen to have a factory wiring diagram for a 1989. let me take a look here.

According to this, the alternator and starter are tied together through the battery, and junction block on the firewall. It looks like the wire off the alternator to the fuse block gets spliced to the ignition relay and a constant-hot slot in the fuse block? hmmm

I could be reading this all wrong, of course.

 

[DaveB]

Maybe I'll have to pull the fuse block out to see if I can trace it out, or I can just add a wire. I did add a test jumper wire last night and got everything to work but I would still like to understand how they wired it. I have a generic 80-87 wiring diagram that shows them tied together but the two harnesses I have don't tie them together in the engine compartment.

 

[Tacoma]

if you want to give me a call I can trace stuff out on the diagram. 435.228.6194