Join Date: Jan 2003
Location: Maine Coast
Thanked 310 Times in 240 Posts
Rep Power: 18
As others have said shutting off the key on most factory wired engines won't harm the alt. It may however shut off your electric fuel lift pump, tach, volts, oil pressure & temp. If you have an electric lift pump you may eventually run out of fuel.
Some alts are key/ignition excite and some are self excite so you may also lose charging or not..
Some battery switches come with a field disconnect terminal so this is yet another way to protect the alt from the dreaded "pass through off"...
-Maine Sail / CS-36T
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