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As an alternator repair guy, I'm going to disagree with Dell. Connecting the #1 terminal directly to the "ACC" terminal on the ignition switch WILL work just fine, and MOST LIKELY never give any problems. However, as I've posted before, if there is EVER a poor connection anywhere in the heavy wiring of the charging circuit, the output of the alternator will take the alternate path through the diode trio and voltage regulator and ignition switch to get to the battery. Adding a diode (or some type of "idiot light") will prevent any chance of this happening. Diodes are cheap, readily available, and I know of NO downside to using them, even if you are sourcing your "excite" power from an ignition switch with an "ACC" terminal. It's a simple precaution, to isolate the #1 "excite" terminal from direct connection to the battery. Lately, I have been using a single 1N5408 diode. That is a 3-Amp diode with a PRV of 1000 Volts, which is more than "overkill" for this application, but they're so cheap it doesn't matter. I just bought another 100 of them on ebay for 11.5 cents each, delivered!
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