It looks like it can be unplugged?  If so I would do that and then check all the monitors and readouts. Does the LED go off when you hit the 12 volt disconnect? Shielding it with a couple layers of aluminum foil may also show if it is sending a signal somewhere.
Good Luck 
PS: You don't have a history with any three lettered government agencies do you...?
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04 Allegro 30DA, WH 8.1, Banks, 03 Honda CRV, Blue Ox Aladdin, Brake Buddy Adv. Select,
300watts Solar, 7 Group 31 Optima AGMs, 2000watt PSW inverter
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