[RipNC]

Some Magnum inverter models (including the unit that came on our 3121RL Legacy) have an ignition trigger wire which needs 12v for inverter to run. However, the inside panel will still light up from the 12v feed direct from battery to inverter. In my rig, if shorepower was disconnected and battery disconnect to coach (inverter battery switch still "on") my inverter would not work and inside panel would be on. Turned "battery disconnect" (my least fa'orite term) switch to on and the inverter works. The ignition wire on our 2k watt Magnum was a single orange/white wire.

PS - no longer have the OEM inverter - went 3k Victron.