Battery going flat E23 735 1985
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Category: Technical & Model Specific Forums
Forum Name: BMW 7 Series
Forum Discription: This forum will deal with any issues on the BMW 7 Series (E23, E32, E38, E65, E66, E67 & E68)
URL: http://www.bavarian-board.co.uk/forum_posts.asp?TID=45173
Printed Date: 18-May-2024 at 05:37
Topic: Battery going flat E23 735 1985
Posted By: bigtelbmw
Subject: Battery going flat E23 735 1985
Date Posted: 03-July-2009 at 18:14
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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. |
Replies:
Posted By: ally
Date Posted: 04-July-2009 at 00:10
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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 http://www.alternatormart.co.uk - www.alternatormart.co.uk , found them on google & service was very good. HTH
------------- E39 530i Sport Aegean Blue Edition Saab 9-5T SE Estate E36 318i loon...sold E36 323i coupe...sold |
Posted By: neoman
Date Posted: 14-July-2009 at 19:36
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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 -------------  
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