10SI one wire alternator

I used a two wire 10SI and a Ford solenoid. The correct solenoid has two small studs, one to activate the solenoid and one that sends a shot of electricity to the alternator to turn it on. I didn't want the alternator to be "hot" all the time.

Biggest concern would be changing everything out to reverse-polarity lightbulbs and flipping the ignition coil upside down so the electrons don't fall out.  :-}

Really- the best way to do this, is to yank the 6volt battery, plop in a 12v, install a red wire from the starter switch to the battery post, a black wire to ground, and connect the stock and ordinary 10SI's output lug to the positive battery post... then yank all the 6v lamps and 6v coil, install 12v lamps and coil, and go for a cruise.

The advantage to using a 3-wire, is that the alternator will self-excite at idle.  Without it (in just one-wire mode) you'll need to bring the engine RPM up in order for the alternator to excite.

I use to run a 3 wire alternator but recently switched to a 1 wire when the 3 wire died. I installed a slightly smaller pulley on the 1 wire and it will start charging as soon as I start the tractor without reving it up.