JoeFarmer,
We need to know whether you have a gas or diesel tractor. My DIESEL did not have an "off" option and I had problems with the three wire ACDELCO alternator. (running down my battery)
D110SiSE12VCK part no. at alternator parts.com
I had an ACDELCO 10SI alternator (3-wire) from factory. The above number will allow the three wire to be a one wire alternator. I can now start my tractor two days in a row without jumper cables, and it all looks factory to the operator. just FYI if you need it. :thumbsup: