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Re: Alternator light stays on
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CarGuru > Volkswagen > Re: Alternator light stays on 27 February 2005 05:19:46
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Re: Alternator light stays on

Randolph 26 February 2005 12:38:44
 
Lamprey wrote:
-With engine on, I read ~11.7V across the battery at idle and at a couple> thousand rpm. With electrical accessories on, voltage is near the same,> ~11.5V.

The nominal voltage is 14.0 Volts, if you read more than 14.5 at any
RPM, the regulator is the primary suspect. Reading voltages below 14V,
as you do, certainly *can* be a broken regulator (although in my
experience, regulator failures usually result in over-voltage, not
under-voltage) but it is just as likely to be worn-out brushes. If the
alternator is original to the car and has never been serviced, I would
start out with a new set of brushes. They should be even cheaper than a
new regulator.
Add comment
Nate Nagel 26 February 2005 13:28:24 [ permanent link ]
 Randolph wrote:
Lamprey wrote:>
-With engine on, I read ~11.7V across the battery at idle and at a couple>>thousand rpm. With electrical accessories on, voltage is near the same,>>~11.5V.>
The nominal voltage is 14.0 Volts, if you read more than 14.5 at any> RPM, the regulator is the primary suspect. Reading voltages below 14V,> as you do, certainly *can* be a broken regulator (although in my> experience, regulator failures usually result in over-voltage, not> under-voltage) but it is just as likely to be worn-out brushes. If the> alternator is original to the car and has never been serviced, I would> start out with a new set of brushes. They should be even cheaper than a> new regulator.

I agree, but I've never seen a factory VW regulator put out much *over*
14V - they seem to run at a lower voltage than American stuff by their
nature.

nate

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Lamprey 26 February 2005 20:47:27 [ permanent link ]
 Forgive my ignorance...what are slip rinds? Same as bearings?


"Woodchuck" <stv_euroski@yahoo.­com> wrote in
news:47298$42206b7d­$41c71383$8472@SALSG­IVER.COM:
Maybe as easy as the voltage regualtor, but if the slip rinds are worn> then it's a good idea to get a rebuilt alt.>
Add comment
Lamprey 26 February 2005 20:53:06 [ permanent link ]
 Never mind...I just woke up. Slip rings, yes? How would I tell if they
were worn?


Lamprey <pleasenospam@pleas­enospam.ack> wrote in news:zK1Ud.514809
$6l.263901@pd7tw2no­:
Forgive my ignorance...what are slip rinds? Same as bearings?>
"Woodchuck" <stv_euroski@yahoo.­com> wrote in> news:47298$42206b7d­$41c71383$8472@SALSG­IVER.COM: >
Maybe as easy as the voltage regualtor, but if the slip rinds are worn>> then it's a good idea to get a rebuilt alt.>>

Add comment
Woodchuck 26 February 2005 22:47:52 [ permanent link ]
 Just look visibility to see if the regulator brushes wore a grove in them.

"Lamprey" <pleasenospam@pleas­enospam.ack> wrote in message
news:SP1Ud.514821$6­l.276086@pd7tw2no...­> Never mind...I just woke up. Slip rings, yes? How would I tell if they> were worn?>
Lamprey <pleasenospam@pleas­enospam.ack> wrote in news:zK1Ud.514809> $6l.263901@pd7tw2no­:>
Forgive my ignorance...what are slip rinds? Same as bearings?>>
"Woodchuck" <stv_euroski@yahoo.­com> wrote in>> news:47298$42206b7d­$41c71383$8472@SALSG­IVER.COM:>>
Maybe as easy as the voltage regualtor, but if the slip rinds are worn>>> then it's a good idea to get a rebuilt alt.>>>


Add comment
Randolph 27 February 2005 04:28:02 [ permanent link ]
 
Nate Nagel wrote:
I agree, but I've never seen a factory VW regulator put out much *over*> 14V - they seem to run at a lower voltage than American stuff by their> nature.

Agreed. The Bentley indicates 14V +/- 0.5V. My experience (two
alternators in my '87 GTi) is that the voltage is within 50mV of the
nominal 14V.
Add comment
Lamprey 27 February 2005 05:19:46 [ permanent link ]
 Thanks for all the info, folks. I pulled the regulator/brush assembly out
and the brushes were worn to almost nothing. Flicked the brushes a bit to
loosen the springs, reinstalled (this actually made the alternator light go
out, but I knew it still needed to be replaced) and drove to my FLAPS to
buy a new assembly ($38 CDN w/tax). Problem solved, and for cheaper than I
expected, hooray hooray!

Had a look at the slip rings while I was in there, and they looked
"experienced" but smooth. No visible abnormalities that I could see. So,
hopefully I'll get a bunch more mileage out of that alternator.

Thanks again, everybody!
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CarGuru > Volkswagen > Re: Alternator light stays on 27 February 2005 05:19:46
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