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Porsche 2000 - 996 Carrera Battery Drain - Alternator Hums and isn&#39


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Hi all

 

I started another post similar where I thought the Horn was the culprit of my battery drain, but it was actually the Alternator causing me a drain, so thought I would summarise the issue on a new post so that this might help other 996 owners and save them a lot of money and time!

 

This is the original post and is detailed, so take a look at this afterwards:

 

http://www.renntech.org/forums/topic/48867-2000-porsche-996-battery-drains-the-alarm-horn-is-a-constant-3v-and-hums/page-3

Issue/Fault:

So my 2000 Carrera Cabriolet was draining the battery in around 6 days, I was showing around 390ma of draw with the car locked and powered down, it should be upto 50ma, so I'm draining a Lot more!

 

The drain was coming from the Alternators thin Blue wire, the one that goes to the regulator on the back of it.  The wire was showing 3.7v Constantly with the Iginition off/car locked and 10.8v with the Key On/car started.

 

I spent money on x2 Diagnostics, new ignition, I also removed all fuses, relays, Speedo Cluster, Blubs, ABS unit, PSM/ASR etc (All are linked to this Blue wire), but nothing helped, the fault seems to be in the middle of the Loom somewhere.

 

FIX:

I could not trace the fault to this 3.7v and I'm fed up of charging the battery and working on the car--- so I removed the rear passenger door panel, carpet and plastic cill tunnel to gain access to Connector "x2/3 black", the blue wire runs through this on Pin5. I unplugged this connector, I then Cut the blue wire as it went into the x2/3, I  lenghtned these wires by 12". I  then removed some of the sheathing on Pin 4 which is Black/Brown, I then soldered 12" of thin wire onto this, insulated all of these wires of course as cabled tied then neatly back up. I then installed a relay onto these 3 wires, and added a 4th Earth wire which I secured behind the door panel to bare metal. I also added a 5Amp fuse onto the relays power wire (the wire coming of the Black/Brown) .

 

I then mounted this relay behind the door panel, well below the speaker (so the speakers magnet does not interfere with the relay). I can then remove the speaker and access the relay Easily, should I need to in the future.

 

 

 

So Finally after months of research on the net, money spent and loads of evenings in the car, Its now Fixed!

 

I did have 390ma Drain, now its 30ma which is very low and awesome!! I don't think I will need to charge the car again as It should last ages and ages unused in the garage and start easily!

 

I would have loved to have found the actual Real fault but without stripping the dash off and hunting for these wires in this area, then I've done everything possible that I can access.  I'm just pleased to not need to charge the car and now I can actually Chill and just enjoy owning, driving and polishing my 996!

 

 

Hope this info helps.

 

 

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