I would think that all MG's that were originally built with positive grounds
have DC motors which are NOT polarity sensitive. I base that decision on what
happens when these cars are converted to negative ground. When that is done, you
don't have to replace or switch the leads of the wiper motor, heater motor, or
the starter. If the starter, a DC motor, was polarity sensitive then it would
run backwards after changing to a negative ground. It doesn't!
The generator must be polarized, as it has some permanent magnetism to insure it
will energise without the battery.
Blake
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