Re: [No HA content] Car "alternator warning light"

[Geoff <Geoff@xxxxxxx>]

On Mon, 27 Nov 2000 09:00:17 -0000, Keith Doxey wrote:

>The alternator warning light is connected beween the output of the
>alternator and the Ingition circuit 12V supply. (12V being the nominal
>voltage - as you point out this will rise to about 14.4)
>
>A permanent dim glow can indicate either excessive voltage drop on the
>ignition circuit (disconnect that 3kW Sound system NOW!) or the
alternator
>not being 100%.
>
>[...]

Thanks all for your replies.

So I guess a suitable fault finding procedure would be:

1) Run a jump lead from alternator body to battery -ve.  If fixed then
one of the earth connections is duff.
2) Check voltage at WL terminal on alternator (c. 14.4v) & compare to
battery voltage - should be the same (within 0.3v).
3) If alternator voltage < battery then suspect alternator brushes
4) If alternator voltage > battery then replace alternator-to-battery
+ve lead.  (if still not fixed then have fun looking for an excessive
voltage drop on the ignition circuit!)
5) Check voltage between WL terminal on alternator and battery
positive (should be <0.5v).  If OK then suspect dashboard wiring.

Make sense?

Thanks,
Geoff
--
"I hope to learn something new every day."


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