[Roadsters] battery not charging

[Wes Jones]

On Tue, 21 Jun 2011 21:06:34 -0400, Tim <tputland at charter.net> wrote:

> 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?

Cattery seems good because it charges up on a charger.  Alt doesn't charge  
the battery and doesn't supply enough amps to run the engine and  
headlights together.

Bad diode in the alt is my guess.

Best, wes




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