DDK - Die Deutschen Klassiker

Any one had a battery drain on their 912?

Just seems I have had a battery too many of late. I must have a drain and I guess I will have to get the meter out to check where I can but as some of the CCT are not even fused I may have a slight issue

So I thought I would just ask if any one has had the same and what did it come down to?

( and before anyone says I have an inline fuse to the radio and I take the fuse out to the radio after every trip out. so as to totally ignore the radio as a fault.

Clock?

Alarm/immobiliser?

I had similar problem on my 912, did a lot of testing, fitted an alternator conversion which I would reccomend but battery on occasions still went flat. Found corroded connection on alternator to battery cable in engine bay just under the near side hinge eventually. Tidied it up and no further problems. Amazed how long the battery keeps charge and how well the clock keeps time

Good luck.

Paul

Check your relays, they can allow an almost imperceptible current to pass which leads to a drain on the battery. I had a 912E that had an issue with the he relay tot he heated rear window. You wouldn't know it until you put an ammeter on it and traced where the current was flowing.

I went through each fuse looking for which one drew a current, then I started going further down on the individual circuits until I isolated it.

Matt

Thanks I will have to investigate more..

Radio fuse is out
Rear heated window not connected
Clock working but not connected

I think as mentioned it's going to be a connection or a relay..

ok it's a start.. might just pay some one else to do it..

Hang in there......

My method of fault finding electrical drains is the following:

1. Disconnect the positive from the battery.
2. Connect a multi-meter between the connection removed and the live on the battery.
3. Select current on the multi-meter (you should see current flow).
4. Pull one fuse at a time and note the reading on the multi-meter.
5. Refit the fuse and continue until all fused circuits checked.
6. When the reading (current) on the multi-meter drops when the fuse is pulled, then this is the circuit to investigate. Obviously the clock and interior lights will draw current.


Don't start the car any stage of the above.

Hope this helps

Jimmy

yes your right it's got to be done...

I will try and have a look at this on Sunday.. been invited to the new 911 show off evening so I might take the old girl with me so I best get it looked out.. would be a tad embarrassing if she falls flat on her face out side the main dealer

Mind you if its raining I am not going in her..

Jimmy wrote:Hang in there......

My method of fault finding electrical drains is the following:

1. Disconnect the positive from the battery.
2. Connect a multi-meter between the connection removed and the live on the battery.
3. Select current on the multi-meter (you should see current flow).
4. Pull one fuse at a time and note the reading on the multi-meter.
5. Refit the fuse and continue until all fused circuits checked.
6. When the reading (current) on the multi-meter drops when the fuse is pulled, then this is the circuit to investigate. Obviously the clock and interior lights will draw current.


Don't start the car any stage of the above.

Hope this helps

Jimmy

I'm going to give this a go too. My battery runs down each time I'm away (usually 2 or 3 weeks each time). For now I need to make sure I disconnect before I head off. I suspect it's the clock on mine although it would be great to narrow it down using the tests above.

Jimmy wrote:Hang in there......

My method of fault finding electrical drains is the following:

1. Disconnect the positive from the battery.
2. Connect a multi-meter between the connection removed and the live on the battery.
3. Select current on the multi-meter (you should see current flow).
4. Pull one fuse at a time and note the reading on the multi-meter.
5. Refit the fuse and continue until all fused circuits checked.
6. When the reading (current) on the multi-meter drops when the fuse is pulled, then this is the circuit to investigate. Obviously the clock and interior lights will draw current.


Don't start the car any stage of the above.

Hope this helps

Jimmy

Thanks for that Jimmy - got the same problem on mine and that's a nice logical process to follow