Posted by john *.?-!.* cub owner on November 22, 2013 at 07:13:35 from (174.125.5.180):
In Reply to: Battery polarity posted by CHARLES B. JACKSON on November 22, 2013 at 05:02:16:
This was 12 volts rather than 6 volts, but I was working in local TV/radio/appliance shop back in late 60s when a kid brought in the radio from the late 50s Chevy his grandpa had given him. I tested the radio and could not find anything wrong, and he took it home and brought it back a day or two later , and I still could find nothing wrong with the radio, so I told him to bring the car in so I could check the wiring. He reinstalled the radio, and brought the car in (really beautiful old car), with half the dash and all the heater controls, etc. laying in the floor. When I started checking it with my voltmeter I realized the voltage was reversed. Checked the battery, and it was installed correctly (neg ground). but battery polarity was reversed.
I asked him some questions and he had taken the battery out and carried it across a field to jump start Grandpa's M, then put it back and next day drove a 150 or so mile round trip. Removing and reinstalling a battery does not normally cause a generator to reverse polarity, but something happened this time. I do not know if he connected the cables backward, then realized the problem and corrected it or what, but the dash only had an idiot light, not an ammeter, and he drove a long enough trip that it discharged the battery and recharged it backwards. I told him to take it home, and leave the lights on till the battery was completely dead then put a charger on it and recharge the battery, and also showed him how to polarize the generator once the battery was recharged. All worked as it should afterward, but the nearly new battery only lasted about 6 months or a year, apparently it did not like being treated that way.
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