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I have run into that situation before. When you try to sandblast the rust out, the sand just packs in there and the rust doesn't get abraded away. What I did was beat on the frame with a sledge hammer which tends to pulverize the rust, so you can blow it out. Then I sandblasted with fine sand...

Kinda thought they were the same

GMC's with automatic are typically the M135 Cargo with single tires and M211 Cargo with duals. Again advanced age of 69 years old needs everything gone through.

Air compressor. See how your truck still has the platform behind the running board. The air compressor was stupid heavy.

Nice truck actually. Fishplated frame means shop van or air compressor was on back.

5. Some clown at Prestolite stamped it wrong after a long weekend of drinking

Could be dozens of issues. Time to break out the voltmeter and starting at the batteries, see where battery power is dropping off.

Take it to Houston Truck Parts on Wayside and chances are you will walk out with a new one.

My opinion: The M35A2 is how you want to go. Parts are a phone call away, GMC parts are getting harder to find every day. The GMC is what 76 years old? Needs EVERYTHING gone though extensively. Find a bad engine M35, repower it, bob it, and go hunt. GMCs are for museums nowadays.

Heath Diesel and other vendors have the non-computer controlled wastegate. Wow you have a lot of patience to fix that rusty mess. Trucks like that I part out without a second thought.

Is that solenoid working good? Looks like it was full of water. The terminal on the cable could have corrosion between the wire strands and the terminal. Will cause your issue also.

Sounds like LBCD problem. What is LBCD? Load Battery Control Device located near spare tire. It has diodes to protect the alternator in case there is a reverse polarity problem. The cables that attach to it are known to get corroded at the ring terminals.

Maybe tractor protection valve.

Whoa. It looks like black engine oil but make sure it's not transmission oil. Transmission is much more likely to puke oil if overfull.

Replace that ancient Michelin!!

Sherwin Williams Chemical Coatings retailer.

And don’t forget there are multiple flavors of relays that uncle loves to play musical chairs with in the sockets. Don’t assume the right part numbers are plugged in to the right spot.

CDR goes there. Crankcase Depression Regulator.

Double check getting 24 volts to the IP solenoid. IP needs rebuilt every 10 years roughly. Plastic parts inside crack.

I say no.