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Message: <blockquote data-quote="dan filipi" data-source="post: 549" data-attributes="member: 54">(This post I was able to get off the old site.It was in a thread to calculate a sufficiently sized external alternator. I edited it a bit.)Ok, So I'm doing some calculations here in preparation for the ultimate alternator according to the physical size constraints and load required.There are 2 units which will fit, one would be better, smaller, but the maximum output is limited because of the smaller housing.These are conservative numbersHere's a list of the stock lighting loads:Headlight= 65 watt high beamStoplight= 2, 27 watt= 54 wattsrunning lights: tail and fairing= 4 @ 21watts=84 wattsLighting total= 203 wattshigh rate battery charge, 4 amps= 48 wattsCooling fan @ 3 amps=36 wattsTotal stock lighting and accessories load= 287 watts(I didnt add in the radio/intercom load because I dont know how much it draws, also turn signals are intermittent loads so they too are not added in)Plus most GL owners want at least 2 55 watt driving lights= 110 wattsNew total load needed to satisfy= 397 watts, call it 400 wattsThis load works out to 33.3 amps at 12 voltsSince equipment ages and current draw goes up as the ambient temperature rises, I'll round off the total load needed to satisfy at 40 amps.</blockquote>