Most importantly and capitalized for emphasis, THE NEGATIVE POST ON THE COIL IS NOT A GROUND AND SHOULD NOT, NEVER, EVER BE CONNECTED TO A GROUND!!!
It is a switched ground directly from the points or EI. When switched on the coil charges up (and heats up), at the instant it is switched off the induced charge stored inside the coil is dumped. The only wires attached to the - post are from the points/EI and if you have one, possibly a tachometer trigger. That's it, nothing else.
At 4.x ohms for the coil and 14.3 V input your current is no greater than 3.75 amps, well under the 4 amp maximum so you're good to go without additional resistance.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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