Anyone have wiring diagram for '88 Crew Cab R10?

[4DR C10]

I'm looking for the factory wiring diagrams of a '88 454 V8 dual fuel tank setup. It's for a old body style crew cab. Anyone have a copy?

I have a '84 diagram and they changed in the later years as my cab and chassis don't match wiring wise.

I'd like to see what the extra wire at the main wiring bulkhead is. Also where the wires coming out of the firewall and switch do.

Thanks in advance.

dave@tmengineering.net