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Ron, Sorry the other guy trampled you with both feet, but I stand by the advice in my other post. Did you take a minute to look at the schematics showing how WHY using the "ACC" terminal on the ignition switch to avoid using a lamp, resistor or diode is a bad idea? Yes it DOES work, (at least 'til something goes wrong), but it introduces a "failure mode" that does not exist if the alternator is wired up as it was intended to be. ANY fault, even a bit of resistance, in the charging circuit will cause the alternator's output current to take an alternate, undesirable path OUT of the alternator, through the diode trio and voltage regulator (which are not designed for this), and though the ignition switch's "ACC" terminal to get to finally get to the battery. I repair alternators for a living, and have seen quite a few instances where repeat alternator failures were finally tracked down to the failure to use a lamp, resistor, or diode in the "switched excite" lead AND a fault in the charging circuit. Several times, I've had to pack up some tools and go out in the field to see what was causing repeat failures, and, more than once it has been the lack of a device to limit or prevent current from feeding out of the alterntor's #1 terminal, BACK into the machine's electrical system. So, sorry to disagree with your method, but I think wiring up an alternator in a way that will increase it's chance of failure is a BAD idea, especially when it is so easy to use a safer method.
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