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You could also jumper, with a decent-sized wire, the two large posts together on the GP relay for 5 seconds or so, then try to start it.

Have you asked the person in the passenger seat to either roll up the window, or put out the cigar? :D

Has the GP relay/solenoid been replaced? If its mounting tabs are not isolated from the small terminals, it will be engaged when the key is on. Assuming the rest of the system is stock. Otherwise, the GP controller card would be my next guess. There is a trouble shooting section of the TM that...

If we are talking about GEN1, the drivers-side alternator, then the little black wire is probably the tach output for the diagnostic connector under the dash. As for a wiring harness, unless someone has some NOS ones out of surplus, the only ones available will be take-outs from other trucks...

Check the useful threads section of the CUCV forum, you'll find lots of info on the GP system, including suggested part numbers for the GP relay.

I was wondering if perhaps the lift pump is dumping fuel into the oil...

The front battery is charged by the left-side alternator, GEN1....

We had a '94 Ford Exploder and the oil pressure gauge *always* gave the same reading if the engine was running, no matter what the RPMs were. Turns out Ford got tired of people complaining that the oil pressure would drop when they came to a stop, and then go back up again when they resumed...

Of course, one could look in the TM to find the spec, as well as the test procedure...

This is confusing, please clarify. If it 'cranks' , then it *is* 'turning over'. In the generally accepted meaning of those two phrases. Perhaps it is 'turning over' but is not starting?

The truck is all 12v, so you can put in a 12v radio no problem. Only the starter, really, is a 24v part. The 24v system really only feeds the starter and the glow plugs ( which is actually dropped down to 12v to actually run the glow plugs ). If you really want to convert it to 12v, look up the...

It should all be in the TMs, which are on this site...

New doesn't mean anything. The runaway could have caused them to fail. Voltage doesn't mean anything, either. How they preform under load is what matters. Load test is about the best way to know the battery is still good. This is step one in any CUCV electrical troubleshooting. Trust but verify.

How was the check of the batteries and alternators done? Have the batteries been load tested, not just a voltage reading?

I don't know if any of the parts are different between the '84 and '86 M1009 tailgates, but these trucks were all built to '84 specs with '84 parts, with very few exceptions, no matter what year they were actually assembled. You should base part purchases on the '84 model year, or the GM part...

Can you read PDFs on the tablet? If so, the TMs are here on the site, the -20p and/or -34p versions will have the parts diagrams and part numbers.

I don't think the hoses are available anymore anyway...

Did the CUCV program exist in '82? The plastic shear pin is so that the steering column can collapse in a head-on collision.

Magic 8 Ball says "maybe" - it may run that way for a long time, or it may not. Throttle shaft seal leaks are fairly common, and can be fixed by replacing the seals. Some here have done that while the IP is on the truck. With the other problem it is having, I think I'd have the pump rebuilt...

Not normal that I know of. What does it go to?