A dual-battery isolation module ensures that both batteries are properly charged and that the primary battery always has sufficient charge to start the vehicle. In many 2-battery systems, the auxiliary battery will be located away from the engine compartment, such as in the trunk or under a rear seat.
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There's the primary battery under the hood, but there's also an auxiliary battery. These are used to power other systems on the car that require 12 volts of power, and which the alternator is not capable of powering directly.
Higher than 15 volts indicates a fault in the charging system's voltage regulator or related circuits. If it's substantially excessive, this can cause electrical system and/or battery damage. You mentioned your voltmeter runs at about 15 volts most of the time.15 mar 2007