If you isolate the battery with the main circuit, and run the alternator field circuit through the normally-open circuit with the resistor, you'll be fine.
The resistor circuit is there primarily to protect the contacts of the main circuit (and really should be used on any car, regardless of what charging system you have). If you simply open up such a high-current circuit as the battery, that load has to go somewhere; without the resistor circuit it arcs the contacts of the main switch. Giving the load someplace to slowly drain protects those contacts.
Further, if the field circuit of an alternator stays energized (as it can with a charning system) then it can harm the alternator.
So, by running the field circuit of the alternator through the NO circuit with resistor, you resolve both problems.
As far as Tech is concerned, if they can reach over and shut off your car entirely with that switch (and trust me, they'll test it) then it's fine. They/we don't give two shakes what it does to the components of the charnging system; their concern is safety, your concern is making sure it doesn't hurt stuff...
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Originally Posted by Joe Foering
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