[Roadsters] battery not charging

[Tim]

OK thanks. I will do more checking when I get home and post the numbers 
I get.

Tim


On Wed, Jun 22, 2011 at 10:57 AM, Pete Peters wrote:

> Sounds like several issues:
>
> 1. Battery only gets fully charged by external battery charger, not by
> alternator.
>
> 2. Ammeter never goes positive with headlights on.
>
> 3. Car will not start unless battery at full charge.
>
> Troubleshooting is same for all three: Test alternator, battery, and
> double-check wiring & grounds (always check those pesky grounds). The 
> GM alt
> has an internal voltage regulator. You can have it tested at your 
> FLAPS or
> an automotive electrical repair place. Got a known, good spare 
> battery? Swap
> 'em out.
>
> More exact voltages would help, i.e. at idle (800-1000 rpm) the output 
> is
> 12.43v, at 3500 rpm it's 14.5v, etc.
> What does battery read fully charged?
>
> How old is the battery?
>
>
> Pete
>
> -----Original Message-----
> From: datsun-roadsters-bounces at autox.team.net
> [mailto:datsun-roadsters-bounces at autox.team.net] On Behalf Of Tim
> Sent: Tuesday, June 21, 2011 6:07 PM
> To: datsun-roadsters: autox.team.net
> Subject: [Roadsters] battery not charging
>
> First off: I am an electrickery novice. Big time.
>
> This is a new condition this spring: 70 1600 w/ gm alternator upgrade 
> done three or four years ago. Alt is putting out over 12 volts at 600 
> rpm idle; more at higher rpm. Battery is over 12 volts once charged 
> with battery charger. But car won't start if battery does not have 
> most of a fresh charge from the charger. Amp meter will go into the 
> negative if I turn on the head lights but never goes into the positive 
> any more.
>
> Is this my regulator going (gone) bad? How do I test it?
>
> Thanks
>
> Tim
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