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Jubal, In addition to Olds good advice, heres my take on your question: If it runs on, the very FIRST THING I RECOMMEND (if youre not using an idiot light in the circuit) is to install a safety 10 ohm resistor in the excitation circuit to the Alternators lil No. 1 side Excitation terminal. That serves as current limiting protection to protect the alternators internal diodes. In the event youre using an idiot light in that circuit, it can serve as the desired current limiting protection, but if its resistance just happens to be a lot less then 10 ohms, I would still add some resistance so theres a total of at least 10 ohms (idiot light plus resistance) in the excitation circuit. Nowwwww wwww its often the case once you add the desired 10 ohm resistor or an idiot light the run on stops. HOWEVER if she still runs on, then add a diode as Old recommended. Its acts as a one way current flow check valve so the alternator dont backfeed the ignition n she shuts off properly. IT MUST BE WIRED IN CORRECT POLARITY + Anode end to coil/switch, - Cathode end to Alternator or it wont work. The above is for the GM 10SI 3 wire Negative Ground alternators. Sure, Ive seen plenty with no currrent limiting protective resistance n they worked fine,,,,, ,,Ive seen some that run on while others dont,,,,, ,,,,but Ive seen some fried internal electronics on the Alternators which may well have beec caused by overcurrent or spikes or surges etc. Good Luck n God Bless John T Nordhoff in Indiana, retired electrical engineer
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