I once tried a high performance coil that was not internal resistor, and was that not bad enough, left ignition on upon quitting working on a non running tractor. Came back next morning and battery was dead. Thunk on it a while during the day, with battery on charge (out of tractor) Then I went to hook battery up, and got a BIG ARC. Hooked up positive leads and grounded to metal to see what was up, and found points lead smoking. checked points next and points were fried. So was coil. Lucky was I that battery was weak, and died quick.
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