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Oh, okay. In any case , it seems that a failure mode of these meters is for the contact to go away between the lugs and the resistor. I cleaned up one and it seemed to start working. Another I had to replace with new resitors. 350 ohms seems to be the right value.

Well, in case anyone else has this problem some day, here's what I did. I saw infinite resistance between the two non-ground lugs. I think there should be some there, as I explained previously. I went and got some 1 Watt, 100 ohm resistors and put 3 of them in series between these two lugs...

I've been beating my head against the wall trying to get my M1008 voltmeter to work. I took it to work and attached it to a power supply and it seemed like it was working, but when I attached it to the truck it didn't. So I took it off and traced all the wires around and stuff... well, turns...