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To be honest, I dont really know...

I think that it is mainly a bad earth or a short somewhere because the alternator works perfectly and the battery recieves over 14v or charge when the engine is revving, but it constantly loses charge and goes flat.

I would assume that it would be a couple of hundred to get an auto-elec to fix (mainly labour).

Sounds like the voltage regulator, does it have a internal one ( Inside the alternator) or external also check the wiring to the alternator, You'd be suprised what grief a loose terminal can cause you. This would be easy to fix guys , An arvo with a couple of beers and a analogue multimeter and a few spanners and voila.

I didnt mean to add that first bit on this thread heres my comment

Check the wiring to the alternator, You'd be suprised what grief a loose terminal can cause you. Check that there no little globes of Leds staying on. Put a Inductive Ammeter onto the battery wiring and check if your draining power while your car is turned off ( Stereos Off Too). This would be easy to fix guys , An arvo with a couple of beers and a analogue multimeter and a few spanners and voila.

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