Our Minnie Winnie dash radio will continue play after ignition is cut off. Assume it is designed that way to use while camping. When radio is playing, does that run down chassis battery? Camper is plugged into elec.
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Both of the 2 class Cs I had the radio was run from the ignition ACC. My Class A's have a power switch on dash that turns on radio and runs from coach battery. Quickest way to determine your power source with ignition OFF and radio on would be to disconnect negative cable on chassis battery to see if radio goes off. If it stays on then is run from coach battery and is recharging with shore power plugged in or generator running.
I have an old class c on a Ford E350. The radio also plays when they key is off and runs off the chassis battery. The chassis battery on mine does not charge from the converter.
When I install a new radio with bluetooth I may change that but we never listen to the radio when we're parked so it's really not an issue other than remembering to turn it of once the key is turned off.
To me it seems like a really poor design. There is an emergency start button so worse case scenario I jump the chassis from the house battery.
Mine stays on after shutting off the engine as do the cab interior and dash lights. They stay on a few minutes and then shut off. But, if you don't want to wait for them to shut off, just open and shut a door and they will shut off.
My 1993 Minnie Winnie also plays the radio if I put the ignition to accessory (cars don't do this anymore). So, obviously it uses the chassis battery. However, there is a switch on the dash that will allow the chassis to use the house battery to start the engine. I am assuming that this was the purpose of this.