Battery drain

[Cooks]

Hi all, 

 

first post! 

 

I have had a battery drain over a couple of days 300ma when tested with a multimeter.  Identified it to be the rear spoiler on my 986, by pulling each fuse and waiting for the reading to drop. Removed the fuse and battery holds charge ok.

 

So stripped the boot out and disconnected the plug on the white boot cable motor (what a mission it was!) no drop in current still 300ma. Pulled the spoiler conections too and the relays in the boot, no change. 

 

With fuse D7 removed the MA drop instantly to 40ma when I lock the doors. With D7 connected Rear spoiler and boot mechanism disconnected. Car stays at 300Ma when locked and when left for 20 mins or so? Maybe need to leave it longer but I just think it is strange that it drops instantly with D7 removed. 

 

Anu advice or help would be appreciated

 

thanks. 

[JFP in PA]

35 minutes ago, Cooks said:

Hi all, 

 

first post! 

 

I have had a battery drain over a couple of days 300ma when tested with a multimeter.  Identified it to be the rear spoiler on my 986, by pulling each fuse and waiting for the reading to drop. Removed the fuse and battery holds charge ok.

 

So stripped the boot out and disconnected the plug on the white boot cable motor (what a mission it was!) no drop in current still 300ma. Pulled the spoiler conections too and the relays in the boot, no change. 

 

With fuse D7 removed the MA drop instantly to 40ma when I lock the doors. With D7 connected Rear spoiler and boot mechanism disconnected. Car stays at 300Ma when locked and when left for 20 mins or so? Maybe need to leave it longer but I just think it is strange that it drops instantly with D7 removed. 

 

Anu advice or help would be appreciated

 

thanks. 

 

Welcome to RennTech

Year and model of the vehicle please

[Cooks]

Thank you! 

 

@JFP in PA it’s a 2003 plate 2.7. Also a UK car. 

 

Cheers 

[JFP in PA]

2 minutes ago, Cooks said:

Thank you! 

 

@JFP in PA it’s a 2003 plate 2.7. Also a UK car. 

 

Cheers 

 

OK, D7 has been used for hazard warning lights and/or the spoiler, but at some point someone may have cut into it to add something.  In general, the spoiler or hazards should not be drawing current when not in operation, as you showed when you disconnected the plugs.  You need to trace the circuit and look further.

[Cooks]

Yeah I did think it was strange that the spoiler and boot mech did not drop the discharge. Seems with fuse d7 out the boot will not open either. 

 

Excuse the the stupid question. When you say trace it back. Do you mean follow the harness from the boot back and make sure nothing is spliced in to it? 

 

Cheers 

[JFP in PA]

3 hours ago, Cooks said:

Yeah I did think it was strange that the spoiler and boot mech did not drop the discharge. Seems with fuse d7 out the boot will not open either. 

 

Excuse the the stupid question. When you say trace it back. Do you mean follow the harness from the boot back and make sure nothing is spliced in to it? 

 

Cheers 

 

Basically, yes.  Something is pulling a drain on the system somewhere between the fuse block and the spoiler, trick now is finding it.

[Cooks]

On 4/11/2019 at 11:49 AM, JFP in PA said:

 

Basically, yes.  Something is pulling a drain on the system somewhere between the fuse block and the spoiler, trick now is finding it.

I had a good look in the boot wiring can see nothing obvious. Would an aftermarket stereo be linked into this. The wiring is abit all over behind there but when I pull the fuse on the stereo the drain doesn’t drop. 

 

 

Also. I have noted that the frunk and boot lights to not light at all. Could this be linked??

[JFP in PA]

39 minutes ago, Cooks said:

I had a good look in the boot wiring can see nothing obvious. Would an aftermarket stereo be linked into this. The wiring is abit all over behind there but when I pull the fuse on the stereo the drain doesn’t drop. 

 

 

Also. I have noted that the frunk and boot lights to not light at all. Could this be linked??

 

Anyone could have hooked up anything to this circuit; people do the damnedest things to electrical systems.  Without looking at it, it is impossible to know.