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Does anyone else have this issue?

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Old Dec 9th, 2019, 16:50   #21
GrahamHR
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Thanks for the explanation re the / last 20%, I never knew that ! I'd not paid the alternator any attention, buried as it is; I just had a look, it is indeed not directly driven by the belt but via an assembly bolted to the side of the engine (3.0 T6 petrol).

The charger is only 7A, the battery has been on charge for a day. The charger indicates it is fully charged, it's holding it at 13.28V according to my multimeter.
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Old Dec 9th, 2019, 17:09   #22
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Quote:
Originally Posted by GrahamHR View Post
Thanks for the explanation re the / last 20%, I never knew that ! I'd not paid the alternator any attention, buried as it is; I just had a look, it is indeed not directly driven by the belt but via an assembly bolted to the side of the engine (3.0 T6 petrol).

The charger is only 7A, the battery has been on charge for a day. The charger indicates it is fully charged, it's holding it at 13.28V according to my multimeter.
13.8 v is too low for charging it , it should be around 14.2 or a little more unless you mean that is the voltage after the battery has been standing un connected overnight?

Yes the alternator is direct gear drive from the crankshaft , there is a rubber coupling which was supposed to have a change interval of 144000 miles , but with the passage of time and miles they have now said it does not need changing ..
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Old Dec 9th, 2019, 18:08   #23
GrahamHR
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When it is actually charging the battery, the voltage is 14.4V. Once fully charged, it drops it to a lower maintenance level.

The cheaper (Maypole) 5A charger I have connected to my Saab 9-3 convertible does pretty much the same; it applies 14.4V to a partially discharged battery and then maintains a voltage of 13.4V
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