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7 Series - E38 (1995 - 2001)

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  #1  
Old 10-08-2016, 10:29 PM
BMW 3-SERIES BMW 3-SERIES is offline
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Location: Arizona
 
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Mein Auto: 2000 540i Sport (E39)
Amateur mistake - Battery Light & Trans Fail

I was checking for faulty ignition coils with the engine running. I pulled out one coil with the grounds, had my hand on the frame of the car and I got the shock of my life.. it went right through me. Since then, I had the battery light stay on although the alternator AND battery are good. Tested.

After that, running for a few minutes, my PRND lights do not illuminate and I get the trans-fail safe. I have checked fuse 22 which was notorious for both my symptoms. With optimism I checked that fuse, only to find it was still good. Now, I am scratching my head and any ideas? '98 740il
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  #2  
Old 10-09-2016, 10:42 AM
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QSilver7 QSilver7 is offline
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Mein Auto: 1997 740iL / 2006 X5 4.4
Unlock your cluster and run TEST 9 (before starting the vehicle & ignition in position 1) which will reveal the battery's voltage before ALL the control modules are running and putting a draw on the battery. It should read somewhere around 12 v and higher...if its at 11.89 volts...the battery's state of charge is at 0%. That is not to say it's dead...but it is relying more on its reserve capacity and cold cranking amps to get the car started.

After the engine is running...then TEST 9 is showing the alternator/charging system's voltage. Take note as you're driving around to see that it remains above 12.5 volts. If the alternator/charging system's voltage dips lower and is displaying lower than 12 volts at any consistent level...then that's why the BATTERY WARNING LIGHT is illuminating. The alternator/charging system is not maintaining a consistent level.

This can occur when the regulator in the alternator is going...or perhaps a belt or belt tensioner isn't tight is failing.
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Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
(SOLD)
99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

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  #3  
Old 10-09-2016, 07:33 PM
BMW 3-SERIES BMW 3-SERIES is offline
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Location: Arizona
 
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Mein Auto: 2000 540i Sport (E39)
Quote:
Originally Posted by QSilver7 View Post
Unlock your cluster and run TEST 9 (before starting the vehicle & ignition in position 1) which will reveal the battery's voltage before ALL the control modules are running and putting a draw on the battery. It should read somewhere around 12 v and higher...if its at 11.89 volts...the battery's state of charge is at 0%. That is not to say it's dead...but it is relying more on its reserve capacity and cold cranking amps to get the car started.

After the engine is running...then TEST 9 is showing the alternator/charging system's voltage. Take note as you're driving around to see that it remains above 12.5 volts. If the alternator/charging system's voltage dips lower and is displaying lower than 12 volts at any consistent level...then that's why the BATTERY WARNING LIGHT is illuminating. The alternator/charging system is not maintaining a consistent level.

This can occur when the regulator in the alternator is going...or perhaps a belt or belt tensioner isn't tight is failing.
Alternator is putting in nice 13.8-14v, without dropping below 12v. They tested good.
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Old 10-14-2016, 03:10 PM
BMW 3-SERIES BMW 3-SERIES is offline
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Location: Arizona
 
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Mein Auto: 2000 540i Sport (E39)
From what I am gathering, the indy is saying he thinks its the cluster. He removed the ground for that bulb, and its still grounding.
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