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Old 11-27-2012, 07:43 PM
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QSilver7 QSilver7 is offline
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Location: Northeast Indiana
Join Date: Aug 2008
Posts: 9,583
Mein Auto: 1997 740iL / 2006 X5 4.4
If you've UNLOCKED your instrument can monitor the output of your alternator/charging system when the engine is running if you open TEST 9. When the engine is NOT running and the ignition is in position 1 or 2...then it will reveal the battery's voltage.

A alternator in good working condition should be putting out 12.8volt to around 13.8 volts. If it is spiking consistently above 14 volts (that's too high). Have you checked your belts? A slipping belt or a belt that is cracked and about to split/rip...could also have caused your momentary red battery well as one of the pulleys/belt tensioners.

Here's the instructions on how to UNLOCK the OBC (instrument cluster) so you can access the 21 TESTs that are available:

Click this link for a description of all 21 TESTs:

Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)
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