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Thank you so much for your help, Gary! I've been out of town on business and running around but finally had a chance to put on the new relay last Thursday! My new ST85 relay is in, replacing the old Ford style relay, and the truck is working perfectly now! The old manual glow plug switch was...

So before I began to trace the wiring from the relay down to the plug, I figured I'd test the relay once again - at which point it read the same low voltage as I had been seeing at the end of the links. I then found out that something is broken either with the lug or inside the relay, as when I...

I'll definitely keep that in mind once I track down this wiring issue - I started out low but tried to ramp it up in hopes of it actually starting in the cold.

Awesome, I think that tells me what it is! I tested the voltages going to the glow plugs from the harness and none of them ever crested 0.17v... no wonder nothing was happening! So is the next step to trace it back from the glow plugs to find the problem? I'm worried that, since a little voltage...

In the first photo, the loom comes in at the top right of image, where one wire (B.) is connected to the top of the glow plug relay and the second (A.) is connected to a ground on the firewall. This must be where the power comes from, as the other set of wires goes forward to the dual fans...

Ah, ok - thank you! I noticed the electric fans up front - is this a common modification for the CUCVs? I'd heard the 6.2s ran pretty cool. Should I put the temp probe in the radiator & adjust the controller, or just leave it tied up where it is? I'll get some photos of the batteries and glow...

Howdy, all! I believe the glow plug system in my new M1009 is not working, and while tracking it down by the TM, I discovered this interesting little box on the driver's side fender. I believe the police dept. converted the truck to 12v when they replaced the driver's alt with an A/C compressor...