[s-cars] Battery update, C4 A6

[John Lagnese]

In a pinch a small light works in place of the meter.

-----Original Message-----
From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com]
On Behalf Of Kent McLean
Sent: Tuesday, December 30, 2008 10:50 AM
To: s-cars at audifans.com; quattro at audifans.com
Subject: Re: [s-cars] Battery update, C4 A6

Lee Levitt wrote:
> Now, if I can figure out why my RNS-E is killing the battery in my 
> C5 A6, I'd be a happy camper!

My 20V200 TQA has a slow battery drain (kills the battery over 2-3
weeks).
I need to go through the debugging routine. If anyone wants to correct
me 
on this, please do.

Finding a battery drain:

1. Disconnect the + cable at the battery.

2. Connect a DVM between the + terminal and the + cable. 

3. Set the DVM to measure milliamps (and don't try starting the car).

4. Note the amperage you are starting with. (If it is less than X ???
ma, there is no drain. The radio (memory) and alarm system? will produce
a minor drain on the battery. We are looking for a bigger drain that
kills the battery in a week or two.

5. Pull one fuse at a time. Note the change in amperage.

6. When you pull the fuse that makes the amperage approach 0, you've
found the drain.

7. Replace that fuse and keep going; you may have a 2nd drain on the
battery.

8. Determine which loads are protected by the fuse identified in step 6
(or 7). 

9. One at a time, remove each load to see which one is causing the
drain.

10. Repair or replace the problem found in step 9.

Comments and corrections welcomed, especially the minimum value that is
an acceptible drain.

-- --
Kent McLean
'99 A4 Avant
'91 200 20V Avant #3
'94 100 Avant, sold
'91 200 20V Avant #2, up in smoke #2
'91 200 20V Avant #1, recycled
'89 200 10V sedan, up in smoke