Re: Looking at my first Model A
One wire alternators always require a little more rpm to excite the unit into coming on line. If a person runs a carefully placed alternator light and uses the other two wires, it will excite as soon as it starts turning.
The old 3-brush 6-volt generator does fine as long as it is maintained but it is low on output. It works OK when the lights are the largest continuous electrical load. 12-volts opens up other possibilities but any installed electrical accessories will have the associated need for further electrical system wiring and circuit protection. The coil will either need a ballast or a change to a 3-Ohm coil for 12-volt operation. The horn will also need to be changed for 12-volt operation.
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