finet@students.uiuc.edu wrote: : Another possible safeguard against battery drain is : to put a spare battery on the left side of the engine compartment and : connect it to the main battery with a resistor(?) which I understand : allows the spare to charge while you are driving but keeps it from : discharging totally when you are parked, thus assuring enough power for That would be a diode, not a resistor. All a resistor does is soak up some energy and convert it to heat. A diode allows current to flow in one direction, but not the other. I would expect that the diode would go between the regulator and the second battery, rather than having a connection between the two batteries, since you want the secondary to charge, and provide power to things not connected to the primary. Dworkin
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