The alternator output post and the #2 terminal should have battery voltage on them at all times. The #1 terminal is controlled by the switch or what ever other method you have to provide power to excite the alternator. The voltage on this terminal will depend upon which method you used to control the back feed when the alternator is charging. Ideally this voltage should be at least half of battery voltage. If you use a diode in the #1 terminal circuit the voltage should be very close to battery voltage. If you use a light bulb or a resistor the voltage will be less. I do like to see less than about four volts with the switch on. The lower the voltage on the #1 terminal the faster the alternator will have to spin to begin charging. Once the alternator starts to charge there will be charging voltage at the #1 terminal so the alternator will continue to charge even at engine idle.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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