I fitted a 2nd hand alpine cd player to my mondeo and yesterday my car had a flat battery and thought it might be the cd player, it there any chance it cause a battery to go flat over night?
Wire it back in and put a meter across the battery to measure the drain, see if the unplugging the alpine cd reduces that drain, if it does then the cd player has an internal fault, if it doesn't then you issue lies elsewhere.
Think it might of been the battery, i changed the battery yesterday and put the stock ford cd player in and just started the car first time this morning...will put the alpine cd player back in