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Ahhh.. 3 Ohms... 60 Ohms.... Slight difference there :) I knew someone smarter than me would correct that. Thanks.

You can also check each glow plug to make sure they're working. Even new ones burn out sometimes. I recommend the AC Delco 60G's. They don't swell and get stuck like some others. You'll have to double-check me on this but I believe each plug should show 60 Ohms of resistance. You can also...

You may want to disconnect the controller card then install a switch, and check your GP relay for proper function also. If you are the only one who ever drives the truck it might just be quicker, cheaper, easier, and less hassle than trying to keep replacing the controller card.

The Glow Plugs need 12V. It's in the TM's.

If you don't cut through the wire, only tack on a separate wire going to a switch, then it won't bypass or disable the controller card. Everything will still function as stock. The advantage is that you have a backup in case your controller card or another component in the system fails, which...

Looks right to me. I just did the same to my M1008 last weekend. Mostly as a "just in case" but more likely as a "WHEN" my controller card decides to kick the bucket. Nothing worse than getting stuck in the woods in a Minnesota winter. I haven't had to use it yet, left the light blue wire...