Posted by John T on November 21, 2018 at 07:14:46 from (174.255.129.220):
In Reply to: Coil-12v or 6v posted by tomturkey on November 20, 2018 at 15:20:14:
Tom good questions here are my answers:
1) "Previous owner converted to alternator."
If so its likely NEGATIVE Ground so the coils input from ign switch should be its + and to distributor should be its -
2) "Shine up points, no spark, test for power to coil good. test light on distributor side of coil, no blinky blinky while cranking."
A test light on the coils output to distributor should flash on (when points open) and off (when points closed) if not shes never gonna fire. If the coils LV primary from + to - is an open circuit (infinity ohms) the coil is BAD
3) "remove wires from coil test resistance with multi-meter, 0 resistance from input terminal to output terminal. Not shorted, but no resistance. Coil is bad-correct?"
Input to output should be around 1.5 ohms if a 6 volt coil and around 3 ohms if a 12 volt coil. If its an open circuit infinity resistance its BAD
4) Wire to input terminal comes from a resistor. Is my coil 6v or 12v? And what do I replace it with?
Typically if it uses an external ballast resistor its a 6 volt coil on a 12 volt system. Again a 6 volt coils has around 1.5 ohms LV primary + to - and around 3 ohms if a 12 volt coil. If its a 12 volt tractor Id use a full true 12 volt coil no ballast required
If all else fails work through my Ignition Troubleshooting Procedure linked below
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