[s-cars] Alternator overcharging?

[Theodore Chen]

i didn't even do that.  i replaced the voltage regulator with the
alternator in place.  i only remember disconnecting some wires and
then removing the screws that held the voltage regulator in place.
i do remember that one of the screws was hard to turn and leverage
was poor, so i used vise-grips on the screwdriver to help break the
screw loose.

it didn't take more than a few minutes to replace the voltage regulator.
i got my replacement from NAPA auto parts, and while it didn't look
the same as the original, all the critical dimensions were the same
and it's been working fine since i installed it.

-teddy

--- Fred Munro <munrof at sympatico.ca> wrote:

> Hi James;
> 
> You can replace the voltage regulator with the alternator in the car - I did
> this on my S4 a few weeks ago. It is easier if you remove the alternator,
> but the long alternator mounting bolt on my car is seized into the block, so
> I had to do it the other way.
> You have to remove the small field wire and the large power wire from the
> back of the alternator. Loosen the mounting bolts and remove the serp belt
> from the alt pulley so you can swing the alt out. There are 3 Phillips
> screws in the back of the alt holding on the plastic dust cover - remove the
> screws and the dust cover (this takes a bit of manipulation). You can now
> get at the 2 screws holding the voltage regulator to the alternator. If you
> grunt and strain and can't budge the screws, you are on the diode block
> screws - the voltage regulator screws aren't all that tight.
> 
> Fred Munro
> '94 S4
> 
> 
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com]On Behalf Of James Murray
> (QA/EMC)
> Sent: November 6, 2005 2:15 PM
> To: s-car-list at audifans.com
> Subject: Re: [s-cars] Alternator overcharging?
> 
> 
> Okay I've tracked down two numbers to fix the alternator or generator as
> Bentley refers to it:
> 
> 049 903 515 C brushes
> 068 903 803 D for the Voltage Regulator with brushes
> 
> Part 068-903-803-D seems to be the right one to go with as the brushes are
> included, which I assume means I don't need part 049-903 -515-C.
> 
> Does anyone know if I can replace the Voltage Regulator on the spot withot
> removing the alternator from the car?
> 
> Cheers, /Jamu.
> 
> 
> 
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com]
> Sent: Sunday, November 06, 2005 1:21 PM
> To: s-car-list at audifans.com
> Subject: [s-cars] Alternator overcharging?
> 
> 
> Has anyone experienced having the alternator overcharge the battery? I think
> my voltage regulator is shot, anyone know how to check this to be sure?
> 
> I found my Battery was dead, when tested the battery voltage without the car
> running I got 16.6V and with the car running it went as high as 18V !!!??? I
> thought my meter was off but I tested it against my battery charger and it
> gave me 12V as expected. So my only conclusion is the voltage regulator is
> toast and the alternator is overcharging the battery thus boiling off the
> acid... I checked the fluid level and sure enough it was low, I filled it up
> charged the battery and the car is running again... but I don't know for how
> long...
> 
> So is it easy to replace the voltage regulator and if so how do you go about
> it? anyone got a part number for this?
> 
> /Jamu.
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