I had to replace my alternator as well....low voltage in the battery will cause faulty gauge readings and irrelevant warning lights until all is restored....I went with a 120 amp Valeo; the pulley had to be swapped from my old alternator...
First, if your alternator is putting out 13.8V while the car is running, your alternator is fine. Period. If your battery passes a load test after being fully charged, it is fine.
I have a 1.8t motor in my Passat; but, I had to replace my alternator last January....and I took some pics...I went from a 90 Amp Valeo to a 120 Amp Valeo....the pulley had to be switched over to the new rebuilt unit (I went to an Alternator/Starter shop) ....old one on the left (90 A Valeo)....new one on the right (120 A Valeo)....
Thanks for the help Waynep, ended up replacing the alternator itself and now its working like a charm!
I had a Valeo alternator from an 03 Jetta in my garage, so I slapped that in and made the connector work somehow. Its working perfect now. 14.5v almost instantly at startup. Weather is below 30F.
The MK2 alternator setup has a fatter bolt than the Mk1 alternator uses. I've seen how the thinner bolt eventually wears into the alternator and it doesn't sit straight. The MK2 alternator setup also scoots the alternator closer to the timing belt end of the engine, giving a little more room by the radiator and a shorter shaft means less torque on the bearings. You'll need the MK2 alternator wiring,.. I just bolt it to the starter.
okay so i installed an alternator in my car yesterday, boosted it, let the battery charge a bit, removed jumpers...car stalled.
Alternators don't make good battery chargers and if your alternator is on its way out then it may not be able to charge the battery. A fully charged battery measures 12.6V when the car is not started. When it's discharged by 75% then it measures 12.4V. if it's like 12V then it's totally dead. When you start the engine and the alternator turns, at idle you should have at least 13.4 Volts. If it's less than this then try reving the RPM's to like 2000rpm. You now should have at least 13.4V. If you don't then you have a problem either with the regulator or you have a bad diode.
I have a 99.5 vr6 2.8 afp and missing a alternator ground i think I am getting 20 intermittent ground fault codes and the kid i bought the car from had a alternator put in.
My Rabbit's alternator lasted a solid 40,000 miles!
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