Looking at the back of the alternater the blade terminal that is counter clockwise to the other goes to the accessory side of the ignition switch. The other one is jumpered to the terminal on the back which also has a 10 guage wire that runs through your ammeter to the battery. If your alternater has a tiny #1 and #2 beside the slot with the blade terminals then #1 goes to accessory and #2 to the terminal on the back. Many of the early switches don't have an accessory terminal and so you have to use the ignition terminal. In this case you have to put a diode in the wire to the #1 blade or else your engine won't stop running with the switch in the off position.

Evan