Question about Audi A4

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Electrical battery drain

Hi there, I have an Audi A4 from 1999, the battery dies if left overnight. I have had a new battery fitted and this is still happening. Sometimes, once I've locked the car the hazard lights are going off, but much faster than normal and the only way to turn it off is to start the car. I realise there may be a parasitic drain, but is it possible to rectify this myself with no mechanical background, or if not, will it be an expensive thing to get fixed? Thanks, Ben.

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  • Audi Master
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Check and test battery wiring,connectors, and equipment plugged into vehicle --if all good the following links will assist with a parasite drain
How to Find Parasitic Battery Drain How to do Parasitic Battery Drain Test Parasite Drain Yahoo Video Search Results

Posted on Jun 12, 2017

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  • Audi Master
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This model has issues with the security system. You might try pulling fuse 2, but make sure the turn signals still work without that fuse.

Posted on Jun 12, 2017

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Posted on Jan 02, 2017

motor1258
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SOURCE: electrical problems - something draining battery

First of all, one of the easiest & cheapest ways to find a draw in the system, if you don't have a clamp on style amp-meter, is with a 12volt test light that costs about $5-$10 at parts stores or hardware stores. You remove positive (+) cable from battery, and simply attach test light in between the battery cable & battery + post. Be careful neither end touches metal obviously. Anytime the test light is lit, you have a draw. If light is nice & bright, it's a fairly good draw, when dim, slight draw. When light goes out, no draw. Now start pulling and re-installing fuses. If you pull a fuse and bright light goes out, you've isolated the circuit.. I usually make sure I have notes or whatever is needed to insure I put fuses back where they should be, then I pull radio fuse and leave it out, as it will cause a constant draw for memory, and sometimes any accessory fuses such as lighter, or power socket for 12v chargers etc. With those out of the way, start pulling and watch light, if no change, put it back in. When I run into a real stumper, I make necessary notes if needed as before, and pull them all out, and light should be off. Now I start putting them in 1 at a time, and watch the light, when it comes on, I note that circuit, pull it back out, and do same with the rest. When your done you will have notes on every circuit that is causing a draw on your battery when sitting. Before you start, take your test light, go to all the fuses and touch little tips sticking out at end of fuses on both side to test for power, if only power on one side, that is a circuit that would not cause a draw when sitting & vehicle off. That would only be powered when key on, headlights on for example, so it doesn't come into play here. Leave those in if you want & it doesn't confuse you. Yes a little time consumming, but hey, think of the learning experience, and a simple test light, is something that every car owner should have anyway. Next time your wondering which fuse blew, you have a test light to tell you. As far as the heated seat goes, if there is a short there, and it's causing a lot of draw, pulling fuse should eliminate & confirm that.

Posted on Mar 07, 2009

  • 63 Answers

SOURCE: left key in ignition overnight, now car wont start

try checking the main relay under the dash

Posted on Mar 15, 2009

bmw_tech_38
  • 113 Answers

SOURCE: 5 series Battery drain.

Hi, you will need to remove the passenger side kick panel under the dash then you will be able to see the side of the heater box, you should be able to see a black milti plug with a 2.5mm red and white wire, if you unplug this you will see the casing for the resistor, this just un clips from the heater box and remove, replacement is just the reverse, hope this helps or if you get stuck just ask for more help, mark.

Posted on Apr 10, 2009

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SOURCE: Audi A4 tail lights come on at night and drain my battery

its the sensor in the brake pedal, happens mostly at cold nights since cold weather loosens up the pedal it causes the pedal to go down by itself if like you were braking, I used to roll up the matt and put it underneath the pedal and that would put pressure upwards while i was researching on how to do it myself found out is complicated and decided to take it to the mechanic for a 200$ fix.

Posted on Jan 25, 2010

  • 166 Answers

SOURCE: Tiburon 04, left turn signal lights stay on

replace the turn signal 'Clicker' also known as the turn signal relay. Most likely the problem unless you have a really wierd electical issue that will be hard to isolate...

Peace,

Posted on Mar 03, 2010

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1 Answer

2005 silverado electrical short in column affects door locks, horn and now drains new battery over nite. seems to be a ground circuit ???


seems to be a ground circuit . Do you know how to do automotive electrical testing ? specifically voltage drop testing ! There are no grounds in the steering column . The power door locks ground at G - 200 an G-203 G200
In the HVAC harness, on the right side of the I/P near the A-pillar below the I/P top cover
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--
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In the I/P harness, on the left side of the I/P near the A-pillar below the I/P top cover

Is the air bag light lit ? Clock spring ! do you know what that is . No horn . The battery drain needs to be diagnosed doing parasitic drain testing .


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