Something cooked

This morning I ran my TO30 for about 3 hours discing up a future food plot. It ran fine. This afternoon I tried to start and when I hit the starter I
saw an arc up front near the starter. For the first time I could not get it started. It would not fire after that. No fire to the plugs. The coil had
rotated in the bracket and shorted one of the connectors to the starter housing. The points are toast, and there is a hole in the rotor button. When I
checked with the voltmeter, I am getting battery voltage, 12.73 volts, at the lead on the side of the distributor. This has been converted to a 12
volt system. Am I right in assuming that downstream of the 2 ohm resistor, at the side of the distributor, that I should be reading 1/2 battery
voltage, or about 6.4 volts? This has been my understanding, and if that's correct, that would explain why this happened.
 
An answer to my own post. I read in the archives that the total resistance in the ignition circuit should be about 3.2 ohms. This should give about 4 amps current max at the points, limiting current not voltage.I checked mine, it is about 2.7 ohms, or about 5 amps current at the points, a little hot.
 
The 2.7 ohms is probably close enough.

The reason you are getting full voltage at the coil is because there is no load.

Try grounding the - side of the coil, then you should get around 6v. Just don't leave it grounded for long, the coil will overheat.

If you replace the points and rotor, it should be OK.
 

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