knealeski at sbcglobal.net
Tue Jun 26 18:22:14 EDT 2007
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 is 13.8.
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.
Id say that you have a bad regulator or regulator ground path.
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