I have the 715 battery box and the low battery alarm is ringing. The box is no longer charging when plugged into an outlet; however, it does charge when plugged into my vehicle. Does that mean the AC power cord is broken?
the first thing i would do is get a multi meter and check that your battery voltage on your battery is above 10.8 volts because the this alarm will sound when your battery is at or below 10.8 volts, this is the first thing to check.
if you confirm your battery voltage is above 10.8 volts the next thing you want to check does the Ark Pak power up by its self with nothing plugged into it ?
you are most welcome to call me on 02 9678 9036 from 9am till 430pm Monday to Friday and i am happy to run you thru a field test over the phone it takes approx 3 to 5 mins.
look forward to hearing an update from you or a phone call.