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Terry,OH · 08-30-2021, 02:57 PM

4 ohm is about correct for a 12V coil with internal resistor. no exterior resistor would be needed. Be aware the ignition condenser can cause the same problems you are experiencing. Plus when the condenser cools while you change the coil the engine should restart and continue to run until re-heated. The voltages you read are correct and do show your battery is charging.

08-30-2021, 02:57 PM	#25
Terry,OH Senior Member Join Date: May 2010 Posts: 4,751	Re: 1948 Ford 12 volt coil issues 4 ohm is about correct for a 12V coil with internal resistor. no exterior resistor would be needed. Be aware the ignition condenser can cause the same problems you are experiencing. Plus when the condenser cools while you change the coil the engine should restart and continue to run until re-heated. The voltages you read are correct and do show your battery is charging.