ground isolation on VRM and PCM

[philso]

Originally Posted by phestnes

Measuring the voltage difference won't actually tell you if the grounds are connected or not - only that the grounds are at about the same voltage reference.

This is correct.

Originally Posted by phestnes

Depending on the multimeter that you use, you may actually be shorting the ground together with the probes - which would show not voltage differential.

What type of multimeter do you have that does this?

Originally Posted by phestnes

I'm actually looking for a resistance measurement between the input ground connection and any/all output ground connections. Mine are reading in the MOhm range....

Do you mean megOhm (1,000,000 Ohm) or milliohm (0.001 Ohm) when you write "MOhm"? I can check on our parts when I go to our build site this evening.