Posted by mkirsch on December 08, 2009 at 05:18:26 from (64.80.108.57):
In Reply to: 1952 Cub 12V posted by Kennebunksawmill on December 08, 2009 at 02:56:18:
13.8-14.5 Volts is correct output for an alternator. It needs to charge the battery, and it can only do that by generating a higher voltage than the battery has. Electricity only flows "downhill" from a higher voltage to a lower voltage.
The coil says "External RESISTOR" for sure. Look for a white porcelain device connected in the wire running from the ignition switch to the + post on the coil. The white device is a resistor. If you find one you are okay. Otherwise you need to get one and add it in the wire between the ignition switch and coil. Most 1960's and early 1970's cars had them, so you should be able to walk up to the counter at NAPA and ask for a "ballast resistor" for an ignition coil off an old muscle car.
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