A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

replaced alternator + battery... my voltage is sitting around 11.5

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Old 11-20-2008, 02:09 PM
  #11  
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new puppies die too
Old 11-20-2008, 02:30 PM
  #12  
Joey T
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Default There are two wires on the back of the 'nator.

You need to follow, and verify, both. One, the smaller, goes back to a pick connections that is just like the AC clutch connector, it is under the coolant jug. This is the signal wire to tell the alternator to run.

The other, larger wire goes to the starter, where it connects to the main battery feed. Of course,if you miss this, all that voltage goes nowhere.


My money is on the small signal wire.
Old 11-20-2008, 02:30 PM
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Default I am going to guess bad voltage regulator, i have bought remanned alt before...

and they never seem to replace the regualtor. Just buy an amp meter, see what coming of the alt is what i would check first.
Old 11-20-2008, 03:29 PM
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Default a response.....

<center><img src="http://i33.tinypic.com/9pt6d3.jpg"></center><p>Mmmm, pints.
Old 11-20-2008, 03:48 PM
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Default is it new or new rebuilt?

rebuilders often mess up. and like teh noob below me said ive had bosch hitachi and valeo units brand new out of the box fail on me.

idk if there is an actual ground strap for the alternator but i figured the main ground comes from its mount which is mounted on the block. which is of course grounded. so i highly doubt ground is a problem

double check your connections on the alternator. and the harness connector. i light connector cleaning and some dielectric grease can go a long way. you can check for resistance in the B+ cable for peice of mind. if all else ok. get another alternator.

you have a bentley. take a peak at the wiring diagram for the charging system. see if theres any type of circuit breakers you might have accidentally popped
Old 11-20-2008, 03:50 PM
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i want that!
Old 11-20-2008, 04:53 PM
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Default Hey Joey my I'm on my 3rd alternator and my voltage is the same as his... sits at 11.5v

and the bat. light is on all the while.. and then I rev to about 1500
rpm and the light goes out not returning until I restart car.

I had my entire electrical system checked out, and even with
different alternators same story.

Do you think the small wire may need replacing? Or do you think
the connection is possibly corroded what should I look for?

Thanks!
Old 11-20-2008, 05:38 PM
  #18  
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2nd - Get on MSN.
Old 11-20-2008, 07:38 PM
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was it the right one?
Old 11-21-2008, 02:15 PM
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interesting i have an 06 jetta that does the same....tracks thread
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Quick Reply: replaced alternator + battery... my voltage is sitting around 11.5



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