^ That's what I was thinking. The voltage isn't going to be 100% constant, but will usually vary from 13.5 - 16.5 volts depending on the system. My old truck (63 Chevy V-8 conv. w/ stock I-6 alt.) used to see 14.4 constant (didn't have a radio or any accessories).
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1993 BB RX-7
2005 Black Mazda 6i
1991 Primer Celica GT
1968 Camo Chevy P/U
Garfinkle's Airpump Idler Pulley: Keep the stock contact patch on your water pump w/o running Airpump!
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