Originally Posted by jennian
Magnum shows red light no comm message. Tvs don't power and outlet behind drivers seat no power. What do I do ???
Check you battery voltage. You might have voltage that is below the operational threshold for the MMS-1012, which is one symptom of a 'no comm' error.
If you do have low battery voltage, you will need to but an external battery charger on them to raise the voltage above 11.5 for the inverter to start it's charging cycle. You also might try driving around for a while, as your BIM (battery isolation manager) should also connect the both battery banks and provide charge to your house batteries from the alternator.