Battery drain A5 3

  • 2008 AUDI
  • 70,000 MILES
Battery drain a5 3.00 v6 battery keeps draining when locked everything is turned off but I can hear low volume noises under the bonnet like a series of light bulbs blowing every so often
Sunday, January 15th, 2012 AT 11:55 AM

1 Reply

  • 20,758 POSTS
There is a procedure for finding a battery draw like that.

You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 10 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.
Was this
Sunday, January 15th, 2012 AT 1:12 PM

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