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True. If you stick a multi-meter set to 200V DC on the top of your GP relay, you'll see 24-25V. As soon as the relay is activated, you'll see the voltage drop to 9.2 then gradually increase as the plugs heat up to 12ish range.

Agreed. Sorry if that wasn't clear. The PO of my truck had the wrong solenoid in the truck, and had a toggle hooked into the fuse box and the other side of the toggle to a small post on the solenoid. There was nothing on the other post. I'm not even sure how it was working, unless it was an...

This is the relay I bought because the PO put the incorrect relay in it (of course). Amazon.com: HVACSTAR Military Vehicle Army Marine 5/4 ton M1008 M1009 M1028 CUCV Glow Plug Solenoid : Automotive That being said, are you saying that if you disconnect that blue wire from the solenoid, and...