The former owner of my 336 had removed the power feed lines from the battery charging switch on the control panel to the factory battery charger/inverter due to different size batteries. I replaced the batteries with a matched gell set and returned the feeds to the switch. Now when I have the charger on and turn on the interior lights, they go dim for a split second before getting bright. I also noticed that the 12V battery switch does not turn off the batteries when switched to off, I still have 12v power to the panel. What is happening? Please advise.