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Audi A6 1998-2004, S6 2002 and later, allroad 2001 and later, rs6 2003 and later (C5) A6 alternator drawing current


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Last Post: Oct 9, 2011 2:10 PM Last Post By: Johniec3
Johniec3

Posts: 77
Registered: 09/06/05
A6 alternator drawing current
Posted: Oct 2, 2011 4:08 PM
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I have an 03 A6 3.0 w/ tip. With the key off, an amp meter between the ground terminal and the body, there is about 0.42 amps pulling on the battery. If my car sits for more than 3 days, the battery is dead.

With the amp meter in place, I have pulled every fuse and relay that I know of with little change on this reading.

As a last attempt, I disconnected the positive wire going to the fuse box, no change. Then I checked the other positive wire going to the alternator / starter, bingo...the amps dropped to 0.02. I then disconnected the main cable from the alternator and sure enough, the amps dropped to 0,02. I believe this takes the starter out of the picture.

Is it normal for the alternator to be drawing current with the car off? Probably a bad voltage regulator?

Any comments appreciated.

Thanks.
FKH161

Posts: 7,661
Registered: 12/29/05
Re: A6 alternator drawing current
Posted: Oct 8, 2011 1:32 PM   in response to: Johniec3 in response to: Johniec3
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I have seen the same on a VW Jetta. Replacing the alternator or overhauling it should take care of it.
honest lou

Posts: 202
Registered: 12/11/04
Re: A6 alternator drawing current
Posted: Oct 9, 2011 12:36 PM   in response to: FKH161 in response to: FKH161
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It sounds like one of the diodes in the rectifiier pack is leaking a little elecitcrcity. Most of the time they open up and you get a lot of A/C on the electrical line. When they short you will have a current draw usually more than .42 amps, usually around 2 - 3 amps. An easy way to check is to use an inductive pickup meter and check the power line from the alternator to the battery. I think a draw of .42 amps (420 ma) should take a number of days to drain the battery. Usually, a not to exceed 50 ma is in the normal range to run the clock and keep the computer alive.
Johniec3

Posts: 77
Registered: 09/06/05
Re: A6 alternator drawing current
Posted: Oct 9, 2011 2:10 PM   in response to: Johniec3 in response to: Johniec3
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I have removed the alternator and have now verified the issue is with the voltage regulator. This is a first for me. The car has been sitting for over a week now (without the alternator), and the battery is fine.

Thanks for the feedback. I will be replacing the alternator w/regulator.

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