Posted by Texasmark1 on May 29, 2015 at 19:49:04 from (184.63.170.149):
In Reply to: Coil questions posted by Freewheelin' on May 29, 2015 at 18:48:51:
My MF 35 service manual says that points are designed to break 5 amps. Considering you are cranking, 12v/5 amps = 2.4 ohms total resistance from the voltage source through the ignition switch, starter switch, ignition coil primary circuit, ballast resistor, points, and distributor to the tractor frame where the battery (-) for negative ground systems is located. Less resistance and you burn up the points over time prematurely. More resistance and you don't have enough energy stored in the coil when the points break to fire the plug properly for combustion.
Voltage is just a mechanism to force the current through the circuit just like water pressure is the mechanism to force water through your water pipes. The resistor is just an orfice of sorts to regulate the flow.
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