1965 Cherokee 140 - POH doesn't say anything about when to turn on the alternator. I've read about 8 pages over on the Vans forums about alternators in general. Seems like a mixed bag (although the most "scientific" posts seem to lead me to believe you should have the alternator switch on before start and after engine stop. Some people say just always leave the switch on and never even turn it off. What do you experts say?