Audi 200 voltage

[L DC]

I had a similar problem with the alternator in my 5KTQ.

I checked all the possible culprits as mentioned here by you as well as fellow listers to no avail.

I then took the alternator off the car and had it tested at two different places, including Advance Discount Auto parts, and was told it was in good working order.

I was baffled.

I decided to simply replace the alternator with a new one (rebuilt) as a last alternative and that did the trick.

Culprit was a bad alternator, despiet test tell the oppossite.

Voltage on the AC screen is 14.6V with just the radio on while running and when the radiator fan comes on it drops to 14.3V .


PS: You could buy an alternator at Advance Discount Auto Parts and make sure to hold on to the receipt.

If the problem still remains, take the alternator off and bring it back to the parts store and claim is either bad or bad part to get your money back. They mess up so much they won't question you at all :-) 


-Regards,

-Louis


> -----Original Message-----
> From: quattro-bounces at audifans.com
> [mailto:quattro-bounces at audifans.com]
> On Behalf Of Geraint Lloyd
> Sent: Thursday, July 30, 2009 10:32 AM
> To: quattro at audifans.com
> Subject: Audi 200 voltage
> 
> Guys n Gals,
> 
> I'm still having stress with starting the 200 10v TQA.
> 
> Having played extensively with the injection system and
> replaced or repaired
> the following items that were either dead or marginal:
> The igloo (from ECS Tuning), sticky carbon canister
> solenoid, CSV wiring,
> Michelin man hose, fuel filter, slightly lose rocker cover,
> wastegate hose
> (mind you it was pretty bloody fast before i fixed that),
> fuel pump check
> valve, cleaned the ISV, injector leak test, ran all fuel
> pressure tests a
> couple of times, injector cooling fan switch (vapour lock
> in CPR
> lines!????!), plugs, cleaned cap, tested ballast in rotor,
> checked codes,
> ran all output tests, vac lines.......
> 
> I'm sure that i missed something there though. In fact i
> haven't pressurised
> the inlet system for a while......
> 
> So it runs pretty well now although there may well be some
> fuel quality
> issues going on. I noticed that the golf (also K-Jet
> (pure)) is no longer
> firing within the first second of cranking for the first
> time in years.
> 
> I think that i have a combination of problems though. I
> think that i can
> eliminate the injection as the source of the hard starting
> and have now
> directed my attention to the electrical and charging
> system. 
> This is because the battery keeps going dead. And when the
> battery is
> totally toast then the car starts really well on the
> emergency jumper
> battery, even though there is no way for it to have built
> up nonexistent
> fuel pressure etc.
> 
> I don't appear to have an out of spec drain, but the
> battery has been
> flattened a couple of times by junior leaving the rear
> interior lights on
> overnight.
> 
> With a freshly charged battery and the AC off, I have 13.6v
> at the
> alternator post.
> 13.4 at the jump start post
> and 13.3 at the battery.
> 
> With the AC on, this drops to 12.6 at the battery and the
> AC head unit says
> 11.6v, but then it's a GM unit so it's hard to think that
> the figures that
> it generates are 100% accurate ;). 
> So i'm thinking that either the AC or the radiator fan is
> sucking the life
> out of the battery, making it progressively harder to
> start. It's been warm
> and humid in Montréal recently and the car spends most of
> its time in city
> traffic, so low engine speed and the fan running at force
> 12. 
> 
> I have 'done' the splice and replaced all of the +ve wires
> at the front with
> some 10AWG and soldered connections although looking at the
> voltages, i
> think that i need to clean the starter post. The ground
> strap was cleaned
> yesterday and had a resistance of <0.01ohms, but is
> pretty blue so i might
> try and find a cheapo one to replace it with just for a
> laugh.
> 
> What voltage or voltage drop should i see with the AC and
> the cooling fan
> on?
> Do i have a problem, or is it just that the car needs more
> highway miles and
> less city?
> 
> Any help would be appreciated!
> 
> Geraint