Before you start taking things apart, check out the wiring diagrams, then start tracing all the wires in the starting system to see what has failed.
Very easy to do. Just takes some time and understanding. This also will help you learn about the truck and you might be able to teach your mechanic something.
I am a computer guy and have worked on cars all my life. I had never even been near a CUCV before last summer. When I had an issue I would printout the diagram for that system, color the wires and went out and looked at the truck.
I have found that the majority of the issues have been due to dirty/corroded connectors. Sometimes I have had to put new terminal connectors on or splice a wire. All simple stuff.
Do not be ocerwhelmed by the CUCV. It is really a very simple machine. It just has a very extra gadgets (ie two alternators). . Try working on the "new" cars.....no thanks.......
If you can follow a line and read letters you can read these diagrams
OK-... have you heard of or know of a common short between the relay and the starter that would cause an over amperage that would cause all this electrical trouble?
Have you downloaded the Technical Manuals? Have you looked at the troubleshooting section?
an over amperage could only be in two wires. The RED wire from the Positive Terminal Board or the PURPLE wire going to the starter solenoid. I would bet that the issue is in the PURPLE wire. It may have shorted to the engine.
Here is the diagram for the starter system. Download it and save it and print it.
Right click on the thumbnail and choose "Open Link in New Window"