73 bus: alternator warning light comes on at high RPM
 

any ideas what this can be?

light only comes on at high RPM (IE, at top of a gear)

Jen

wrote:
> any ideas what this can be?
>
> light only comes on at high RPM (IE, at top of a gear)
>
> Jen
>

Does it come on when the key is first turned On (engine not running)?
--

Speedy Jim
http://www.nls.net/mp/volks/

yeah,

the light functions as it should when
key is ON, engine is not running.

Off: when key is off
OFF: when key is on, engine running, (low)-(mid)-(low-HIGH) RPM

ON when key is on, engine is off
ON when key is on, engine on, HIGH RPM

Jen

wrote:
> yeah,
>
> the light functions as it should when
> key is ON, engine is not running.
>
> Off: when key is off
> OFF: when key is on, engine running, (low)-(mid)-(low-HIGH) RPM
>
> ON when key is on, engine is off
> ON when key is on, engine on, HIGH RPM
>
> Jen
>
Good info.

The only thing I can think of that would cause the
light to go out at high RPM is poor contact between
the brushes and the slip rings.

If the brushes are worn and have less spring tension,
they will tend to "float" off the slip rings at high RPM.

That's my story, and I'm stickin' to it! <g>

--

Speedy Jim
http://www.nls.net/mp/volks/

I just replaced one of the brushes...

Must be the other one on it's way
out. I'll open it up and replace the
other brush, and see if it helps.

Jen