Posted by JMOR on August 04, 2012 at 20:30:03 from (99.105.24.57):
In Reply to: Help needed posted by Stick welding on August 04, 2012 at 08:32:43:
Quoting Removed, click Modern View to see"Finally, dont let anyone tell you it dont matter which polarity you wire a coil, its true she will still spark if wired bass ackwards, but its more efficient if wired at the correct polarity. If its a Neg ground tractor, + (Battery) on coil wires to switched ignition circuit (or ballast if used) while - (dist) wires to the distributor. Reverse that for Pos ground. "
That's right.......don't let anyone tell you anything unless they can fully explain why. And just connecting + to + and - to - is not going to guarantee you maximum voltage, even though it will yield a negative HV spark, Sir! It depends on the particular coil. If the coil was designed for a Positive ground system & you change it to a Negative ground system & leave coil wired as it was from factory, you get full voltage out, but a Pos polarity spark. Swap the coil wiring & you get your Negative spark, BUT at a lesser voltage, by the amount of voltage across the primary during the spark (typically 100:1 ratio). You can NOT have both neg spark & full voltage UNLESS you swap to a coil with a different winding sense/connection of primary & secondary, as in a coil designed for a Negative ground system. + to
+ and - to - alone will not cut it. This technology is 100 years old & still the information floating around is "what I've always understood/heard" instead of real hard fact. It is just amazing!
Another aspect that really kills the spark polarity aspect is that both the center & side electrodes are cold at start up, just when you need a hot spark the very most.
Further more, your old magneto tractors have every other spark output alternating +/- in polarity, as did all the old HD motorcycles, and many 'wasted spark' modern engines.........so just forget spark polarity, once & for all!!!
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