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      01-23-2013, 09:30 AM   #10
xenon
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Drives: 2018 A6 Avant S-Line
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Quote:
Originally Posted by doughboy View Post
Engine running volts shows the alternator is doing its job, but engine-off no-load voltage is not a very good indicator of battery condition, you need current/load to see how the volts drop to see if the battery is shagged.
Totally agree but you can tell from the off-load voltage if a cell has gone short (plate-fuse) because the battery will only show 10v. However, I'm showing my age as I doubt that happens any more with gel-filled "wet" cells.
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Current: 2018 A6 Avant S-Line MMI+
Previous: 2014 F31 320d M-Sport, 2013 F10 520d M-Sport, 2011 F10 530d M-Sport, 2008 320i M-Sport Coupe, 2002 325i, 2001 318i valvetronic, 1998 318i, 1996 525i, 1990 Porsche 944S2