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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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