[s-cars] Alternator problem - Help!

[qshipq at aol.com]

 Yup Audi did the same silly 'splice' design on the C4 without much change....
The C4 cable splice is located on the PS floor behind the plastic cover that holds ecu and relays.  Might also want to ck voltages at starter post (on frame rail) and at the jump post on the PS engine bay.  The splice behind the ECU cover has one feed from the battery, and connects to the cable going to the jump post, and the cable going to the starter post on the frame rail.  The voltages should be identical at the 3 points (Battery, jump post, starter post).  If not, likely the cable splice.

HTH

Scott J

 


 

 

-----Original Message-----
From: Peter Golledge <petergolledge at gmail.com>
To: J R <audiurs4 at gmail.com>
Cc: s-car-list at audifans.com
Sent: Thu, Oct 14, 2010 7:53 pm
Subject: Re: [s-cars] Alternator problem - Help!




Sounds like a classic bad alternator, ABS light gets illuminated due to low 
volts (not enough V to run ABS valves)

One question though... if the Battery is at 12.2V (low but not hugely bad) how 
can the Alt be at 7.2V?  Might want to
check the resistance of the Alt - Battery cabling.  The Type 44 (5000/200) had a 
frequent failure in the splice in the
footwell but I don't know about C4.

I always rebuild my own Alt so I know who to curse when the break, so far no 
cursing. :-)


On 10/14/2010 5:12 PM, J R wrote:
> I've got the battery light, brake light and ABS light lit on the dash
> console.  At higher RPMs, those lights go out, only to come back on when
> RPMs drop.  I'm only getting 7.2 volts at the back of the alternator at
> idle.  Battery is putting out 12.2 solid.  I just had it rebuilt a few
> months ago and it worked fine until now.  I replaced the serpentine belt and
> tensioner (needed it anyway), thinking that maybe the belt was slipping.  No
> change.  I just replaced the voltage regulator hoping for a cheap fix.
> Again, no change.  Anyone have any ideas?
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