The 10SI has a built in regulator, so the old regulator will go away.
The wire on the regulator labeled BAT can be reused. Extend the wire to the alternator and connect to the BAT terminal. This is a high current connection, so be sure to properly splice the wire. By using this wire, the amp gauge will still work.
The other 2 wires, (arm and field) previously on the regulator will not be used. Those same wires will be disconnected from the old generator and not used.
You will need to run a wire from an ignition source, through a resistor or diode, to the #1 terminal of the alternator. The simplest way to connect is using a small incandescent 12v lamp as a resistor. You can add it as a charge indicator light on the dash, or tape it up out of sight at a convenient location.
Also run a jumper wire from the #2 terminal to the BAT terminal.
If you didn't pick up a harness plug for the alternator, go back to the auto supply and get one, it will make the install much cleaner and less likely to short out.
Assuming this is already a negative ground system, if not it must be changed to negative ground for the alternator to work. Be sure the alternator is mounted securely, the pulley is properly aligned and the proper width. Any shortcuts in this area will cause rapid belt wear, slipping, and bracket breakage.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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