Question about BMW 750
This symptom is asociated with the lights relay or the light switch.
Posted on Jul 18, 2009
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Posted on Jan 02, 2017
THE SAME THING HAPPENED TO MINE. AFTER $400 I REALIZED IT WAS THE FUSE WHICH IS CONNECTED TO THE ALTERNATOR. IT WAS BROKEN AND WOULD COME LOOSE AT ANY SLIGHT BUMP, THEN IMMEDIATELY KILL THE BATTERY. FIRST THE RADIO WENT OUT THEN THE DASH LIGHTS. ANYWAY I GOT A NEW ONE FOR $40 AND PROBLEM SOLVED. =]
Posted on Jun 16, 2010
SOURCE: my car have a good
if the battery is good and the alternator is charging then you have a battery drain which is taking power while its not running to find this out you nead a multimeter at can tire you can buy one for under 20 dollars now on the meter you have a 10 amp plug on the positive and a ground plug use these two plugs and the mult meter switch to 10 amp dc i think there is only one position on the whole meter its not like ohms or volts etc now unplug the ground cable on car bat the black wire from battery install the multimeter between the battery and the cable if the meter shows .03 amps its ok there is no drain but if its over .o3 then you have to find where its drawing power its a long process but you will find it by taking out fuse by fuse example with the meter plugged open drivers door the meter should go to .55 which is high and make sure all the lights are off keys out of ignition and so on
Posted on Jan 06, 2011
SOURCE: Have New battery and Alternator,
Since you are having a new battery and alternator the charging circuit of the electronic charging unit is a possible suspect.
All what is required is to check the charging voltage when the engine is started, if there is no increment of voltage when the engine runs the alternator then the connection from the alternator must be checked. Check the output from alternator, check the relay box which contains the charging unit. It can be a failure of the rectification or the stabilising circuit, the unit must be replaced.
Posted on Sep 21, 2011
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