[Roadsters] battery not charging

[Tim]

"If the battery still lacks power to crank the engine then I would 
suspect the battery as faulty."

The battery does take a full charge from a battery charger.

"If you see the battery terminal voltage increase with revs"

Well, I did manage to NOT test the battery at higher rpms so I don't 
know if it this or not. I will check this when I get home.

"If the engine is running, when turning on the headlights you should see 
a momentary dip of the ammeter needle to zero from +, then the needle 
should recover to the + side to indicate charging."

The ammeter does not go + after turning on the headlights in the 
situation. It does dip negative, but only goes back to center, not to 
the positive side like it used to.

Thanks
 
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On Tue, Jun 21, 2011 at 8:37 PM, Graeme Suckling wrote:

>>
>>
> If you see the battery terminal voltage increase with revs. to ~13.8 - 
> 14.2 then the alternator and Voltage Regulator may be OK.
> If the battery still lacks power to crank the engine then I would 
> suspect the battery as faulty.
> Can you swap for a different battery to verify.
> If the engine is not running [i.e. not charging] turning on the 
> headlights will cause the ammeter to go negative [i.e. discharge from 
> battery]
> If the engine is running, when turning on the headlights you should 
> see a momentary dip of the ammeter needle to zero from +, then the 
> needle should recover to the + side to indicate charging.

> Adelaide
> South Australia.
> ________________________________________