OK....
Fully charged battery was at 13.20 right after the little green light
came on so the charge could not get any fresher.
Cold engine (if it matters) @ 550 rpm the battery was 12.74 and the alt
was 12.20-12.50
Warm engine (again, if it matters) @ 1000 rpm battery was 12.58, alt was
16.2-16.4
@ 3000 rpm battery
was 12.56, alt was 15.7 ish
after returning service screw to idle: @ 600rpm
battery was 12.60, alt was 12.6-13.10
Do these numbers look correct?
I will check the grounds this weekend and also have the battery load
tested.
Thoughts please?
Thanks!
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@autox.team.net
> [mailto:datsun-roadsters-bounces@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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