530I E39 Battery Going Flat.

[cliff1948]

Hi recently bought a 530i Sport e39 2002, having a problem with battery going flat (or at least wont start car). There is some battery there locks,lights work etc. The battery is 18 months old (Bosch 90 amp)had it checked said it was ok. also the alternator was checked out. Not doing big mileage with the car,if not used for a day or so will start first thing but will not start later on. Heater motor seems to work ok. The resister was changed in 2008 also alternator. Any suggestions.

[Guest Mister Dabsy]

Poor earth connections will be the cause... That is if the Battery and alternator are as good as you say ;)

Do you have any aftermarket things plugged in? Has the ICE been changed?

[cliff1948]

I will buy a new battery this week,going for 100 amp and I'll check the earth. Got no confidence in my current battery. Euro parts who checked it say it's ok but an auto electrician did'nt give it full marks.

Thanks

Cliff

[Guest Mister Dabsy]

Good idea, BMW's do not like piss-poor batteries !!