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*hides shame* I'll retest tomorrow and take a better look. Sent from my moto g power using Tapatalk

A multimeter, a cheap one. Sent from my moto g power using Tapatalk

I have the solenoid wires and batteries disconnected, measuring from the wire to a solid ground in the engine bay. Sent from my moto g power using Tapatalk

It's an isolated ground unit, the charging system is working fine according to the meter. There's a very slight reading of continuity at the blue wire, but I haven't checked it for resistance, not sure what the resistance should be if I did. My glow plug controller card is new. Ouch$$$ Sent...

Interestingly, there's a tiny bit of continuity from the blue wire to ground with the card pulled and the wire disconnected from the solenoid. Sent from my moto g power using Tapatalk

[emoji23][emoji23][emoji23] Sent from my moto g power using Tapatalk

Thank you for your straightforward response and diagnosis steps. I'll give it a shot tomorrow and report back. Sent from my moto g power using Tapatalk

I recently bought my 1986 M1008 and it immediately started draining the batteries. I have verified that my alternators are good. The passenger side is fairly new and the driver's side was replaced with one from NAPA. Both batteries are new Group 31, though I had my back battery fail and not sure...