[Roadsters] battery not charging

[Jim Gammon]

Make sure of the ground as well.....

Jim


________________________________
From: "Keith0alan at aol.com" <Keith0alan at aol.com>
To: tputland at charter.net;
datsun-roadsters at autox.team.net
Sent: Thursday, June 23, 2011 9:48 AM
Subject:
Re: [Roadsters] battery not charging

It looks like the alternator is working
but the current is not getting to  
the battery. The battery voltage should go
up when the alternator voltage 
goes  up. The most likely problem is the wire
from the alternator to the 
battery. If  it goes through the amp gauge then
the gauge may be bad. The gauge 
is the first  thing to burn out if the system
is overloaded, a very expensive 
fuse. 

keith w


In a message dated
6/22/2011 2:41:33 P.M. Pacific Daylight Time,  
tputland at charter.net writes:
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 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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