Question about 1989 BMW K 100
Don't rely on on whether the bike will start at a gas station to determine if the charging system is working. Get the multimeter out and do a proper test. Should be getting about 14.5 volts @ around 3K RPM. It's too easy of a test to to just skip. If it is charging then start looking for something else. Was the new battery properly charged to begin with? Loose battery connection? I suppose the GPS could be too much but you said that it was dying last november, so I would suspect something else. P.S. you need a properly charged battery to get an accurate reading for the charging test.
Posted on Nov 20, 2008
The BMW/Marig batteries aren't what they used to be. Check the battery with a hydrometer after it has been completely charged. My guess that you will find a bad cell.
Regarding charging: The BMW voltage regulator only allows the charge voltage to rise to 13.8 volts (nominal) - if the voltage is slightly below this figure you may have an issue with the regulator. If the voltage fails to rise higher than 12.8 volts the charging system is defective.
Because the regulator only charges at 13.8 volts the battery will be slow to charge if it's unusually discharged.
Posted on Feb 09, 2009
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Posted on Jan 02, 2017
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