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Alternator was bad, replaced with used unit from a Passat for $55, love driving again

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Old 08-06-2006, 05:05 AM
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Default Alternator was bad, replaced with used unit from a Passat for $55, love driving again

The car has been down a bit recently and it's great to be driving it again....

6/26-7/6 - down after stripped plug in driver's head, head replaced

7/7 - after putting the engine in hours earlier, took it to the drags and made a bunch of 11.9 passes, including my current best: 11.90

7/8-7/15 - washed the car and parked it in the garage, cleaning and waxing it the week leading up to Waterfest

7/16 - drove it to Waterfest

7/17-7/23 - maybe drove it a day or two in here

7/24 - took it out and ended up <a href="https://forums.audiworld.com/s4/msgs/2421328.phtml">limping home with 8 volts on the battery gauge</a>

8/1 - planned on driving car to Autozone to have them test what was bad - car wasn't going to make it that far, so instead swapped in my Golf's battery. Same issue (~11V when car running), so decided alternator is culpret.

8/2 - bought a used alternator for $55 at a junkyard instead of the list of $600 for a new one. FYI remans were avail for $180.

8/5 - installed and car runs again - woohoo! 70F degree night was a blast to romp on the car a bit too )

<img src="http://ctny.audiworld.com/mark/s4/pics/pics06/dsc04090.jpg">
Old 08-06-2006, 05:33 AM
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this is your 1st or 2nd in 170k+ miles?
Old 08-06-2006, 05:38 AM
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Default Good call on the $55 alt! And that 11.90@122....noice. What rpm are you launching at and do you

launch at the same rpm regardless of the oct you're running (93 or 100)?
Old 08-06-2006, 05:42 AM
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Default I'm still on my original. Was just mentioning to friend about that being the next worry.

It can't last forever :-/
Old 08-06-2006, 07:15 AM
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Default how did you source the alternator?

when people have posted in the past about replacement, there seems to be alot on confusion regarding amp rating, manufacturer...etc.

also was this a local junkyard, or through car-part.com?
Old 08-06-2006, 07:25 AM
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congrats! How much had to be torn off to get it out?
Old 08-06-2006, 07:59 AM
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Default ETKA says the S4 uses a 120amp.

IIRC, Mark's original was a Bosch and the replacement was a Valeo but they seem to be interchangeable.

Found at a local (MA) junkyard through car-part.com.

-Dave Pramanik
Old 08-06-2006, 08:22 AM
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that was my orig alternator, car has 154k miles, 4.9 yrs old, still on OEM battery
Old 08-06-2006, 08:23 AM
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drop clutch around 4000-4500 depending on tires, grip, etc
Old 08-06-2006, 08:24 AM
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yeah, what dave said )


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