Hi Mike,

measuring with an ohmmeter as you`ve done won`t bring any true result,
because the compressor is an electrical motor and has not only resistance.
With your method you should substract the values and you will get .4 ohms as
the motor`s resistance. At 12 V voltage the current of that compressor would
be 30 A. I don`t think, your compressor will have such a high current.

Better check the current of your compressor with an amperemeter. In most
cases current is labeled on motor or compressor. If the current is much
higher than the labeled value, then motor has a problem.

You can`t get the current only from voltage and resistance because every
motor is a generator at same time, that makes it a little bit complicated.

Juergen

"C1gmlm" schrieb im Newsbeitrag
...
My electronic module went bad on my Cold Machine and the shop suggested
that I
check the resistance of the compressor. When I check the resistance
between 2
of the points my meter shows .8 ohms. When I touch the 2 leads of the
tester
together I get a .4 reading. Do I subtract .4 from the original reading to
get
the true resistance in the compressor? I have 3 different points to to
check.
Thanks

Mike