Originally Posted by UKDUDE
If you're referring to SB 164, I had it installed and now wish I hadn't.
See my post about this service bulletin
. I think that you are correct that hooking up to 110V power, the Magnum Charger/Inverter will no longer operate (charge batteries) unless the battery disconnect switch is turned to “ON”. That’s how it always should have worked. From my owner’s manual, page H-11, “When you’re plugged into shoreline power or running the generator, with the battery disconnect turned to “ON” the inverter/charger charges the battery and carries much of the load.”
If your dealer wrecked your battery by forgetting to move the battery disconnect switch to “ON”, that’s on him.
The relay added by SB-164 should have no effect on charging from the alternator while driving or charging from solar. If your van is failing to charge from solar or while driving after adding SB-164, then the service was performed incorrectly and you might want to go back and have it fixed.
I’ve posted more details in the other thread
about exactly what SB-164 does.