Quote:
Originally Posted by phestnes
I'm just referring to a simple multimeter design that would effectively place a resistor in parallel with your measurement points. A floating ground would then "ground itself" to the other connected terminal. It isn't a real short.
Mega Ohm
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The input impedance of a good quality DVM is greater than 10 megOhm. This would not be considered a short. An inexpensive DVM, like the ones from Harbor Freight, may have lower input impedance but it will still not short two circuits together.
If you are really seeing megaOhms between the input an output grounds, it would indicate that the VRM and PCM are isolating.
With your meter set to read resistance, short the two leads together. Verify that you able to get a reading that is less than a few Ohms.