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Old 11-09-2000, 12:07 PM
Arthur Dalton Arthur Dalton is offline
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,768
Your seeing no difference using the a/c mounting bolts and/or the manifold as ground is not a good ground test.
Take the reading from the a/c plug and use the battery neg. as the ground . If that reading is higher, your poor ground is the ground strap from the engine to the frame of the chassis.
[ usually down around the trans bell housing.]
That is what is meant by bad chassis/engine ground.
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