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Schuster, depending on the box you installed you may or may not see glow plug cycling on the voltmeter. The original Prestolite boxes would cycle the glow plugs with relays that you could hear and you'd see the voltmeter drop. Some of the later more electronic boxes don't do that.

AOR, the opening post says the truck has a 60 amp alternator in it. Schuster, the fact that the current draw goes away when the control box is disconnected does not necessarily mean that it is suspect since so many other circuits draw power through it. Don't discount it as the source of your...

The schematics can be found for free by downloading the 280-20-3 TM. They're at the back of the manual. In vehicles with the 60 amp alternator the output of the alternator goes thru the control box so it's not surprising that the current goes away when you disconnect it. BTW, as mentioned you...

Go out (or online) and buy yourself a DC clamp on amp meter. They start around $25 but make sure the one you buy measures DC current. Put it on your + battery lead and look at what causes the current draw. If it starts when you turn the switch to run then start disconnecting things until it...