Wes writes:


As others pointed out, the ohm meter reading isn't very reliable. My bad.


There are several reasons to avoid the ohmmeter approach. First is you
are asking to screw up and toast the meter. Even if it is a Harbor Fright
$3 special, it's still a bummer.

But the bigger is this. The ohmmeter applies a test voltage to the circuit.
It's going to be far less than the 13-15v a running car has. One of several
failure modes for semiconductors is to leak, and the leak is proportional
to the voltage drop... and not just linearly. Raising the voltage from
say 5 to 10v might get you 10 or 100x the leakage, not just double.

Result? You do NOT see the leakage with an ohmmeter. You will see it in
ammeter mode.



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