Battery keeps discharging

[mediaman111166]

Hi all,
The battery on my Toledo 2.0 tdi Sport discharges when the car has sat unused for more than 18 hours, ive had a new radio fitted, as I had one that turned on by itself. I thought this would cure the draining battery, dealer fitted a new battery as a precaution but its still doing it!. I cant relie on the car to start anymore The dealer is gonna have it for a week, leave it for 2 days to stand and try and get to the bottom of it. Any ideas anyone?????? Could it be the alternator not completely charging battery, or any thing staying on in the car? I assume it doesnt take much Amps to drain a battery?
HELP!!!

 

[aceman]

I seem to remember someone else having the same problem see here.
Looks like the radio caused the battery discharge in this case but I would suspect a faulty rectifier on the alternator is draining the battery.

 

[mediaman111166]

Thanks alot, ill pass it on to the garage next week