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If it were mine, I would toss the alternator with EXTERNAL regulator, get a Delco 10SI with INTERNAL regulator, and wire it up according the the correct diagram from the site linked below, depending upon whether it has a front-mount or a side-mount distributor. (After typing the above, I opened your picture link.) The setup you have is a Chrysler-style voltage regulator connected to a Ford alternator! This DOES work, though! The regulator must be grounded. One terminal on the regulator will be fed from the ignition switch, and the other will be connected to the alternator's field, and it appears the blue wire does this. However, I do not recall which terminal is which on the regulator, and am 25 miles away from my referance materials at the shop, as I post this. If these wires are, or have been reversed, the regulator will be "toast". The setup you have certainly can be made to work, yet for what has already been done, you could have bought the much simpler internally regulated Delco. On the alternator, the blue wire is the field connection, and the voltage (with the engine running) at the field will vary from near full battery voltage, if the regulator is calling for max charge, down to near zero, if the battery has come up to near full charge, and the regulator is cutting back. The red wire is the output, and should read battery voltage, and be connected to the ammeter. In Image 30-1, is the ignition switch terminal connected to the regulator's red wire the "START" terminal, or the switch's "ACCY" terminal? It needs to be connected to the "ACCY" terminal. So, my advice, if you want to fix what you have: 1.) We need to verify the power from the ignition switch is connected to the proper terminal on the regulator. 2.) We need to verify that the regulator wire is connected to the switch's "ACCY" terminal, AND that the regulator has power to it when the switch is "ON". 3.) With the engine running, the "field" terminal on the alternator must have voltage to it, and the alternator's large output stud should be outputting 13.5- 14.5 Volts. (After typing the above, I Googled, and found THIS SITE): Link
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