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Turns out it was the adjustment of the MPU. I put the original back in, backed it out 1.5 turns and got about 0.9 VAC dead cranking. Turned it back in 1/8 turn and I was at 1.6 VAC, did another 1/8 turn and was at 2.3 VAC, tightened up the nut and it runs great now.

Yep, I know exactly what "relay" that is. Thanks!

Been a while. So I have now sold all my spare 802s except for this one that won't stay running unless the MPU is disconnected. I measured the resistance of both the spare MPU and the one in the unit. Both are right around 141 Ohms. So I really don't think that's the issue. Here they are...

Finally had a chance to work on the unit some yesterday. I removed the MPU and cleaned off the little bit of rust stuck on the tip. Re-installed and adjusted and I still get the same thing. I remove the MPU from my spare set and noticed the connectors on the ends were gone. Anyone know if a...

The MPU is not loose and the 2 connectors going to it are tight. I'll pull it when I get a chance to inspect it and make sure it is adjusted correctly. I do have a MPU from my spare set that I'll probably just swap in when I have it out anyway. All the screws on the wiring terminals and by...

I swapped out S14 from my parts 802 and same behavior. I then put S14 from the unit acting up into a good 802 and it started fine. I'll check the wiring going to the S14 socket next. The 802 acting up was running fine a few weeks ago when I last moved it around.

I tried 3 different relays in the K16 socket and they all acted exactly the same. Here's one of them "dancing":

I have a 802 with the exact same symptoms. It ran fine a few weeks ago, but when I tried to start it yesterday, as soon as it fired, the solenoid would cut off. If I manually hold the solenoid in the run position, it runs fine. There are no faults LED lit up. I put a pair of Noco chargers on...