I stand corrected. Thanks. You are correct, you will get unreliable information with low voltage. But the question still remains, Is an expensive clamp on meter worth the cost when it may only be used 1 or 2 times over the life of a car when a $2 resistor and cheap digital meter will give the same information under the same conditions?
When I made that post I knew I would regret it.

Paul

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84 500 SEL (307,xxx miles)