Seriously this is a good point and I have preached it for some time. When I said rev the engine, the only thought I intended to come across was for you to raise the engine rpms beyond the alternator cut-in point. This 'usually' is above idle, sometimes 1,100 or 1,200 rpm. I DO NOT know what the alternator cut-in point is, I have been too lazy to find out (so I run my engine at about 1,300 or so). If the cut-in point is below idle, and the output of the alternator is sufficient at that rpm, then you are fine running the engine at idle while working the top. Is all of this necessary? No; is it prudent? Damn skippy! Supplying proper amps to the electric motors will provide a longer service life. The worst thing you can to any electric motor is to starve it of amperage. It does not have as much to do with saving the battery. Although, an indirect result of doing this also extends the life of the battery because it is not being drained. Trust me, those electric motors cost much more than ANY battery you could put in your car. Another train of thought, do you need change your oil every 3,500 miles? Do you need to use synthetic oil? The answer to all of these questions is NO, but you are definitely much better off!
(sorry I was in a hurry , no speeel cheek) :)
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