 Alvin..... ...I HATE 1-wire 12v alternator conversions. I HATE 12v conversions that arn't done correctly. 12v conversions arn't like a chinese resturant menu, 1 from column A, 2 from column B. It don't work that way. The most common and popular 12v alternator is the 3-wire Delco 10-SI which has a built-in solid state voltage regulator. To regulate the alternators output, the regulator must know the voltage at the battery. Because of the shortness of tractor wiring, we can "fake" the voltage regulator by connecting the alternator's BIG output stud with a short wire back into the voltage regulator. BUT the 3-wire 12v alternator needs its butttkickked with a "switched excite" wire from the (where else?) ignition switch ON terminal. Simple, eh?....EXCEPT....once the alternator starts charging, it BACKFEEDS volts out to the ignition switch ON terminal which is also conviently connected to the ignition coil. Wannna guess what don't happen when you turn yer ignition switch OFF? .....whoops..... engine don't turn off. Use yer ignition switch ACC terminal to provide isolated "switched excite" for yer 3-wire alternators #1 teriminal. Simple, eh? That is why GeneralMotors used an IDIOT-LITE. It stops the volts from inside the alternator from going backout to the ignition coil. Many 12v conversions use a pre-wired trailer marker-lite between the alternator and the ignition switch ON. Can you say IDIOT-LITE? One-wire alternators have all that stuff internally wired. The reason I don't like 1-wire alternators is ya haffta "jazz" yer cold engine to about 1800rpms before it starts charging. Automobiles thats ok 'cuz yer engine is gunned to gitt yer car moving. Tractor engines don't operate that fast and their governor gitts the tractor moving..... ....respectfully, Dell, a 12-volt advocate for the right reasons That said, I haven't found the right reason for my eazy starting 6-volt 8N, and I know how to do it right, the FIRST time. Infact, I know 8-ways to do it and they all work.
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