Bought on June 18 and finally abandoned. The green light never came on, but I was able to check the voltage on the starter battery side when connected to the house batteries and ground. My batteries died due to a small parasitic discharge and I had to replace them at $180 each. I struggled with trying to keep my batteries charged and finally settled on a separate charger when parked. So does this charger work? I have no idea as it will never support my batteries and the green light showing 'on' never comes on. But the output voltage was 13.4 DC when the input voltage was 13.6 DC. The charger should only be switched on when the voltage of the starter battery falls below the voltage of the on-board battery. I bought another one hoping I just got a bad one, but you know the old saying about a fool and his money.
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