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 - Threshin Demonstration - by Michael Delaney. Introduction I bring you greetings from Prince Edward Island, Canada. We are Canada�s smallest province but big on farming. Maybe you�ve heard of us. Potatoes are our biggest crop. However, there is lots of mixed farming here also. I have a small mixed farm with 25-30 cattle. I make very good use of old machinery. I have a 135 MF Diesel, Farmall H and 1/3 share in an Allis B. I have complete lines of tillage and harvest equipment, and a saw gear etc. I have everything one would
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