hawkeye, do you use your magcharger charger in your vehicle? if so, does it continue to charge when you shut the engine off or does the charger shut off a few minutes after the engine is turned off? i have my magcharger hardwired to the battery of my f-250. the truck has dual batteries cos its a diesel. the charger only works when the engine is runnig. if i turn the engine off the charger shuts off after a few minutes. the destructions say that the charger can detect the voltage of the vehicle battery and will shut off if that voltage drops below a certian point to keep from draining the vehicle battery. i'm not sure what voltage the charger is looking for on the vehicle side but it seems with two fairly new batteries in my truck it should be able to maintain enough voltage to keep the charger running after the engine is off. i wonder if my magcharger isn't overly sensitive.