If you are working with a common 10SI or 12SI Delco 3-wire alternator, they need to have the "excite" current to their #1 terminal shut off when the machine is not running, or the battery will be drained.
If the machine has battery ignition or is a diesel with an electric fuel shutoff, the "excite" circuit can be set up so it's fed from the "ignition" switch, so it's "OFF" when the engine is "OFF".
If the engine has a mag, a DPDT switch can be wired so that it "kills" the spark and shuts off the "excite" circuit at the same time.
An alternative is to use a 2-pole N.O. oil pressure switch so the "excite" circuit is only powered while there is engine oil pressure (engine running).
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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