You are right Andrew – your alternator output voltage is still too high!
You should see a maximum of 14.0 and 14.5 volts. Also after the engine has run a few minutes the ammeter indication should taper off to just a couple amps of charge. (If operated at higher voltages for very long it will eventually cook your battery...)
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From your description it sounds like the mitsu alternator is internally regulated. And if it is indeed internally-regulated and you have nothing connected to the alternator aux terminals, there is no “voltage sense” feedback to the regulator. This then auses the regulator think the output voltage is too low. So it boosts voltage to compensate.
You might try this (Note: Do this at your own risk – I’ve not tried it myself!):
1 – Disconnect the battery ground cable (for safety…) then any the wiring to the alternator.
2 – Take an ohmmeter and measure the resistance from each alternator aux terminal to ground. One terminal should have a very low resistance (a few ohms); the other very high resistance (many thousands of ohms).
3 – Connect a new wire between the HIGH resistance aux terminal and the alternator’s output terminal.
4 – Now reconnect the other alternator wiring and the battery ground, start it up and see what happens.
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Unfortunately I do not have a diagram for a 10DN (externally regulated) Delco alternator. However I’m sure a quick google search can turn one up….
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