David.Schaible at jrspharma.com
Wed Jun 27 12:25:34 EDT 2007
My last bout with these alternators yielded a bad brush which was making
intermittent contact where it should not. It was not a bosch rebuild.
I scavenged a set of brushes from a 10v alternator that were bosch and
the quality difference was amazing....no more Chinese cheapo crap on my
From: Kneale Brownson [mailto:knealeski at sbcglobal.net]
Sent: Tuesday, June 26, 2007 6:22 PM
To: Bernie Benz
Cc: 200q20V mailing list
Subject: Re: Alternator ailments
OK, putting the car on the hoist so I could get to the alternator more
easily, the voltmeter starts reading "normally" again, jump post voltage
So I have an intermittent voltage regulator function? Could that be
a bad wire (other than the famous "blue") to the alternator or something
internal to the alternator or the regulator?
Bernie Benz <b.benz at charter.net> wrote:
On Jun 26, 2007, at 1:59 PM, Kneale Brownson wrote:
> Finally got a chance to test my charging system that started acting
> up while we were in Columbus, OH, over the weekend but managed to
> get us home.
> With the engine off, the battery reads 12.5 volts. Same reading
> for the positive terminal post under the hood.
Implies no current flowing between the two points.
> With the engine running at idle (voltmeter in car reading ~12),
> the reading with my multimeter is 12.17 at both the battery and the
> jump post.
Still no current flowing.
> I presume that means the regulator ain't regulating properly, but
> the dreaded wiring "weld" in the passenger footwell is passing on
> its voltage without any resistance.
Resistance only impedes current flow, not voltage.
> Is it possible the "exciter" circuit (blue wire) would be the
No! The blue wire is not an exciter circuit. It provides a ground
path and a bucking voltage to respectively lite and extinguish the
alternator warning lite, among other unrelated things.
I'd say that you have a bad regulator or regulator ground path.
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