I've logged and noticed that the battery voltage can fluctuate between 12.4V to 14V. I've also confirmed this on another exact same car. Also, others around the world have reported this too:-
http://www.subaruforester.org/vbulletin ... tor-38052/
I just talked to the Subaru importers, and they know all about this problem, including having looked for ways of fixing it without modifying the ECU software. They can offer no solution other than driving with the fan or lights on all the time. Apparently it affects all models since 2004, and is due to trying to get the best results from carbon emission tests by keeping the generator off-load.
Workaround is to have some ancillary load (like the lights or internal fan running) to get the ECU to command max charge from the alternator.
The reason I raise this is that in light of the fuel-pump rewire mod mentioned in this thread http://forum.liberty.asn.au/viewtopic.php?f=18&t=26838&hilit=dw65, something I was contemplating, it could be in vain if your alternator is not at max output
Has anyone experienced this? Other than leaving my lights on is there a way to force the charging?