have you narrowed the drain down to the radio?While I am chasing an electrical circuit drawing .25 amps, I thought about replacing the radio. How does one get the old one out?
you need to say which model radio...better still a photo.
There are all sorts of tools for the different models.
for instance this type of Blaupunkt with two little holes each side, would use the tool that looks like a piece of coathanger, bent in a in U form
yet my later model Blaupunkt uses flat keys.