The way it was once explained to me... and I stress that I DO NOT KNOW if this is correct or not... was that you should think of a battery as a sort of reservoir for the electricity that your alternator is making. Now your alternator is going to continue to make electricity as long as your engine is running.. but if you disconnect the battery all that electricity that would normally be stored in the battery has nowhere to go and you run the risk of burning out your diodes and other things. So as a safety feature if the battery is disconnected the engine will stop. Now, again, I don't know if that's true or not... it's simply something I was told a while back.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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