Battery going flat E23 735 1985

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   Hello again,
The old girl is playing up again. At 24 years old it should know better but the battery keeps going flat. I bought a new one and it lasted three days. Now my maximum charge is 12.9 volt nowhere near the correct 14,6 v. I drove it yesterday and today my battery is kaput. Checked the usual, boot light etc and getting a bit fed up. Considering new voltage regulator, alternator itself or a box of matches etc. Anyone have a sensible-ish solution as I still enjoy the old lady.

Edited by bigtelbmw

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bigtelbmw Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced Newbie Joined: 22-March-2005 Location: Northumberland ENGLAND Status: Offline Points: 36	Post Options Post Reply Quote bigtelbmw Report Post Thanks(0) Quote Reply Topic: Battery going flat E23 735 1985 Posted: 03-July-2009 at 18:14
	Hello again, The old girl is playing up again. At 24 years old it should know better but the battery keeps going flat. I bought a new one and it lasted three days. Now my maximum charge is 12.9 volt nowhere near the correct 14,6 v. I drove it yesterday and today my battery is kaput. Checked the usual, boot light etc and getting a bit fed up. Considering new voltage regulator, alternator itself or a box of matches etc. Anyone have a sensible-ish solution as I still enjoy the old lady. Edited by bigtelbmw

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ally Members Profile Send Private Message Find Members Posts Add to Buddy List Really Senior Member II Joined: 11-October-2004 Status: Offline Points: 1529	Post Options Post Reply Quote ally Report Post Thanks(0) Quote Reply Posted: 04-July-2009 at 00:10
	Hi First thing would be to use a multimeter & check the battery voltage whilst running the engine, this will tell you if it's being charged or not, & would the rule out the drain etc. Not sure about your car, but usually an alternator fault is shown by the battery light illuminated on the instrument panel. A new / reconditioned alternator is fairly easy to replace, I got mines from www.alternatormart.co.uk , found them on google & service was very good. HTH Edited by ally
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neoman Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 04-March-2006 Location: Galway, Ireland. Status: Offline Points: 72	Post Options Post Reply Quote neoman Report Post Thanks(0) Quote Reply Posted: 14-July-2009 at 19:36
	i would have checked the alternator first especially as she isn't getting the full whack of voltage, my alternator regulator gave in and a new 150 amp alternator was over 1100 euro, they told me it couldn't be reconditioned but a guy in galway who specilalises in alternators told me different so cntrary to BMW's claim i now have recond 150 amp alternator and constant 13.5v. my advice check alternator first, your old batteryt was probably fine and would hasve been ok with a recharge after the alternator was reconditioned Edited by neoman