You don't "specifically" need to have the battery installed to have shore power plugged in.
It is recommended to have a battery when camping tho.
Yes you should have shore power unhooked when removing battery as the shore power runs the converter which charges your battery.
The delay in the switch sounds like its a bad switch not workinghe battery.
Would be a good idea to have the battery checked tho.
Do any of the other switches do this?
posted via my troll-mobile hand held type device.