If a tractor is wired Pos ground, the coils - receives ign switch voltage while its + wires to ground via distributor terminal and eventually the closed points. IE The coil polarity has to match battery polarity for most efficient ignition....
HOWEVER if its Neg ground, the coils + receives ign switch voltage while its - wires to ground via distributor terminal and eventaully the closed points.
THE REASON FOR ALL THAT IS SO THE PLUG ELECTRONS FLOW FROM THE HOTTER TIP TO THE COOLER GROUND STRAP but if the coil is swapped from the above, electron flow is the wrong way, cool strap to hotter tip.
I see no "EXTRA VOLTAGE" The coil only rises and ramps up high enough so current arc jumps the plug gap BUT NO HIGHER. Its just that if the polarity is correct allowing electron flow from hot tip to cold groudn strap THE VOLTAGE DONT HAVE TO RISE AS HIGH BEFORE THE ARC OCCURS and thats more efficient,,,,,,less work for the coil,,,,,,less wasted heat losses
I guess I may not understand what their argument is all about with talk of "extra voltage" given the physics as I understand it as described above. Bottom line, if the coil polarity correctly matches battery polarity (see my first 2 paragraphs for whats correct) its more efficnet and firing voltage is a few thousand less volts since its much easier to arc the gap if the electrons are flowing the right direction (which correct wiring described above accomplishes)
Thanks again, fun chat, the post above spoke of no way firing voltages were different, I was ONLY trying to educate and explain the engineering and physics of how n why voltages ARE DIFFERENT IF POLARITY CHANGES. Im trying to help NOTTTTT fight
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