Mike
It is only later wiper motors with permanent magnet fields that are
polarity sensitive. Motors fitted to most, if not all Austin-Healeys; I
am not certain about later Sprites, had wound field coils. It did not
matter on these what the polarity of the 12 volts was, the motor would
still turn the same way.
Regards
> "I've recently reinstalled a Lucas wiper motor that was out of the car for a
>long time and bench tested OK when connecting the terminals directly to a
>battery. Now that the wiper motor is back in the car there is apparently
>something wrong inside the motor because now there is a direct short within
>the overall electrical system. ....................."
>
>Since the motor has
>been out of the car for a long time - is there a chance that the polarity of
>the car has been changed in the meantime?
>This would give the symptoms you are
>getting. The only difference between running the motor off a battery and
>installing it in the
>car is that the motor's case is connected to one side of
>the car's battery. The motor case will be connected to +ve or -ve internally
>depending
>on whether intended for +ve or -ve earth vehicle.
>
>Mike Brooks
>'56
>BN2
--
John Harper
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