Battery Drain on Passat 110 TDI Comfortline '97
 

Hi.

I have just bought a Passat 110 Variant TDI Comfortline from '97, and the battery is drained from full charge to 6V over night.
I have bought a new battery but that doesn't help anything. I have gone through all fuses and no issues there. I have turned off every lamp in the car so no drain from those.

The car has A/C and a webasto engine heater (but I haven't used it), and a original blaupunkt radio with navigation.

Can anyone please help me, I would be most greatfull

Thanks in advance

Update
 

So now I have found out that the battery was faulty and couldn't hold neither it's capacity nor its voltage.

I changed the battery to a new one, and the problem seemed solve.

BUT, now the battery is yet again discharged :-( I have tested the battery and it seems fine, so my only conclusion is that something is discharging the battery.

Any ideas? I have heart that the generator could cause discharging issues, any comments?

Thank you in advance

It could be the alternator. Try getting it tested at one of your local auto parts store.

Hi.

It has been a while since I found out what the problem was. Firts of all I needed a new battery but even then my battery was drained occasionally. As it turned out it was a missing piece of plastic that prevent the water from running through my pollen filter and into the cabin, thus preventing every wire and electric component from being wet...