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In terms of complexity, I'd actually say the military control system is more convoluted than the civilian controller, as there's less wiring required to run the newer civilian controllers like you have installed... Whoever did the conversion on your truck simply did a sloppy job, and wasn't...

I'm not familiar with how the civilian GP controllers work, unfortunately, so I'm not much help there. For what it's worth, based on your photos, it doesn't look like you're too far off from the original military wiring...you could return it to the stock setup, if you were inclined to do so...

Correct, that gray unit that has the large-gauge orange wires attached is a 2-in-1 unit: it's both your glow plug controller AND your glow plug relay. EDIT: The red circle is the controller/relay, the red and yellow arrow is your 12v power wire that's feeding the glow plug relay, and the blue...

Follow the pink/black wire in this photo on the engine side of the firewall. Where does it go? It should go to glow plug relay. Also, the purple/white wire that is spliced with electrical tape with a red wire at the top right of this photo...the red wire goes around the grommet and thru the...

Edited: Just saw your post, let me review your photos.

I agree with your assessment, someone has definitely messed with your wiring. The WTS light bulb should be fed by a pink wire with a black tracer (pink/black) and grounded through a dark blue wire that is controlled by the glow plug card. This dark blue wire should backtrack through the main...

Negative, I don't think that's the correct connector/bundle, but I'm diving into the wiring TM's right now to verify the wire colors. I've taken your photo and added some colored arrows to highlight the harness that we're looking for. Largest arrow at right should be where the grommet goes thru...

Not my finest photography with a cell phone, but hopefully they'll give you an idea... Below are photos from my M1008 and my M1031. I don't have an M1010 to verify, but the glow plug wiring locations should be identical. The grommet you're looking for is slightly adjacent to the fuse block...

The GP card box in my M1008 was attached to the brake pedal bracket with a small plastic clip to prevent it from hanging by the wires. There's a removable flap on one end of the box from which you extract the GP card. EDIT: Easiest way to locate the GP card box is to follow the wiring from...