Check out the specifications of the disconnect switch I listed. It has a low-current set of contacts to isolate the alternator output if it's wired correctly. That prevents feedback to other circuits to avoid the run-on situation you described.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!