97 E250 problems

[shaun00723]

i just recently had a ford dealership put a new engine in my van
and my battery keeps going dead '''but i think its because im not using the van at the moment and its sitting to long in this cold weather
but here is my main problem'' when im sitting in my van and its running
i can here the engine winding through my speakers
and when i turn the radio off and shut my van off and take the key out of the ignition i can hear a little static ''crackling noise in the speakers
'''the van sat with a blown engine for 3 years and i noticed mice in the van ''any help would be greatly appreciated