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Discussion Forum

Coil polarity

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02-12-2003 12:20:41

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my new old tractor is 6v positive ground and has an FM magneto that was converted to a distributor. The coil has the positive post conneced to the battery and the negative goes into the magneto. Is this the right way or should I reverse the coil leads? Tractor runs ok but spark is pale yellow...maybe because the leads are backwards? Any thoughts?


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Steve in N.J.

02-12-2003 17:24:01

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 Re: coil polarity in reply to mike, 02-12-2003 12:20:41  
Dan is correct on the hookup for positive ground wiring systems. Just switch the wires. And yes, on some coils, (depending on how tightly they're wound on the secondary side) will put out the correct amount of power(more)when current is being fed from primary coil winding to secondary coil winding the way it's designed. On some coils, if you check the spark after it's switched, you can actually see a more whiter type spark than yellow. Just watch ya don't get zapped! The situation is more critical with 12V systems if the wiring is run backwards. I've seen some coils fail after being hooked back up the correct way after they were run for a long time wired wrong... Steve B.

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02-12-2003 12:33:11

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 Re: coil polarity in reply to mike, 02-12-2003 12:20:41  
It would be best to have the coil hooked up correctly. The "-" terminal on the coil should go to the - terminal of the battery. The + terminal should go to the points because when the points close, it is effectively connected to the + terminal of the battery. All you have to do is reverse the wires. Don't know if it will make a big difference though.

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