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I forget the OP topic but the engine is stealing some power for ingition and other functions.
These don't look like very major differences with them on but something Ernie accidently dropped is your alt is nowhere near 100% efficient. On a good day its 60-75%. So it takes anywhere from 30-50% more power from the engine to make those watts. The more you draw the bigger the problem. Like I said that 200w in your cigarette lighter is going to be more like 300-350 watts(.4-.5 hp).
Also adding a few of those functions together and its serious gas mileage(for quick and easy just add 1/3 more than what it cost originally to account for ALT inefficiencies).
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