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Somehow I have the urge to post "We don't need no stinkin battery light".
AP, the dealer didn't do you any favors. You can also get a battery light if an alternator has a bad diode in some cases, AC volts get into the mix, but the batteries will still charge. But there is a synergism in the electrical power structure, as Mark pointed out post 11, one can hurt the other. Excessive voltage is another to look out for, slowly cooking the batteries to death.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.