My '47 coupe with 59AB flathead is still 6 volt. It has a resistor on the coil, which from what I have gathered from searches here and on fordbarn, is factory correct. Although this is the 5th flathead I've owned, it's the only one that had not already been converted to 12 volts. My understanding is that the resistor lowers voltage from 6 to 4 so that points don't burn up. That being said, I have had several "oldtimers," which is anyone older than me (I'm 58), tell me that the resistor is not necessary and that I can throw it away. In the threads I've read on resistors on these 6 volt systems, the answers are all over the place, with some saying the resistor needs to be there while others say it is unnecessary. My question is, what is the correct answer? The coupe starts quicker and runs somewhat better without resistor but I don't want to burn up points, either. The resistor, coil, & condensor are all new, BTW.
Depends on your coil. Some need a resistor and some do not. Measure the resistance of the coil. You need around 3 ohms total resistance.
>>>The coupe starts quicker and runs somewhat better without resistor >>> I'd keep the resistor in the circuit and maybe use a starter solenoid byp*** for faster starts. As for running somewhat better, have you done a tuneup---points, plugs, wires, condenser, adjust carb, timing etc. Do your charging system, wire contacts & battery check out OK --- more touchy in a 6v system? Jack E/NJ
If using the original Ford 6V coil, you need the resistor. If you're using the can type 6V coil, you do not use the resistor.
Thanks for the answers, very helpful. I have original style coil, not the '49-up can style. I will leave it as is. I drove it 50 miles yesterday, smooth as silk!
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