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Badpuppy · 10-09-2019, 12:06 PM

Third brush is basically a current setting. Since 12V components require only half the current, the setting for 6V will be twice that required for 12V.

If you used a dropping resistor with your original coil, it will require the same current and your 5 amp setting would be proper (the series resistor will dissipate the same amount of power as the coil in useless heat). If you replaced the original coil with a 12V type, however, then 3 amps should be about right.

Check your battery voltage while charging - 14.4 volts would be ideal; at 15.8 volts the electrolyte will begin to hydrate from overcharge. Note everything varies with engine rpm. Replacing the cutout with a modern regulator is a good idea.

10-09-2019, 12:06 PM	#4
Badpuppy Senior Member Join Date: Dec 2017 Location: Guthrie, OK Posts: 1,145	Re: Generator Charging Third brush is basically a current setting. Since 12V components require only half the current, the setting for 6V will be twice that required for 12V. If you used a dropping resistor with your original coil, it will require the same current and your 5 amp setting would be proper (the series resistor will dissipate the same amount of power as the coil in useless heat). If you replaced the original coil with a 12V type, however, then 3 amps should be about right. Check your battery voltage while charging - 14.4 volts would be ideal; at 15.8 volts the electrolyte will begin to hydrate from overcharge. Note everything varies with engine rpm. Replacing the cutout with a modern regulator is a good idea.