It should range between 0 ohms and 30 ohms.

Check the strap from the underside of the stud to the bottom part of the unit. It likely has some resistance (6 ohms) in one of the connections.


'38 Chevy 1-1/2 ton
'49 Chevy 1/2 ton
'54 Chevy 6400 2 ton
'55.2 GMC 3/4 ton
'56 GMC 1-ton

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