The effects of installing a battery in reverse polarity position in an old tractor whose wiring has been converted from 6 volt positive ground to 12 volt negative ground is shown in this video. The Delco 12v negative ground one wire alternator does not fare well when the frame of the alternator is fed 12 volts positive and the output terminal (BATT) is connected incorrectly to the negative side. That is essentially reversed polarity. The direct short that resulted took out most of the current carrying conductors in the circuit....all the way up under the dash, through the loom and back to the alternator. Yep, it was a LOT smoke really quick.... or so I was told by he who shall remain nameless. I promised to not bust his (or her) chops on the video. Doesn't matter anyway. What's done is done, and by the time the video is over, its re-done again. Well, almost. I didn't replace the smoked alternator on this episode....as a matter of fact, it was just changed out the next morning and its been running like a scalded dog ever since.
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Massey Harris 30 Smoked Wiring-Results of Reversing Polarity
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