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Helpful ReplyBattery Drain

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andrewmarston1
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2020/07/16 11:37:42 (permalink)

Battery Drain

I have just had a new battery fitted to my 996 Targa, but when the battery was checked to make sure everything was ok the readings said that I have a battery drain of -1.3amps, is this ok and a normal reading? 
 
The car at the time of testing the battery was not running, but the front trunk was open to gain access to the battery and the drivers window down and key in the ignition.
 
it may be normal but it just seemed a little high to me.
 
kind regards
 
Andy

Porsche 996 Targa
BMW 125 M Sport (Daily driver)

Motorhead
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Re: Battery Drain 2020/07/16 12:40:49 (permalink) ☄ Helpfulby andrewmarston1 2020/07/17 15:23:09
That sounds way too high to me Andy. A rogue radio/PCM system or tracker maybe?
 
For starters I'd try pulling fuses while monitoring the current drain to see if you can track down the source.
 
Jeff

987.2 Cayman S
North Beds (R10 & R24)
Richard_Hamilton
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Re: Battery Drain 2020/07/16 17:04:25 (permalink) ☄ Helpfulby andrewmarston1 2020/07/17 15:23:05
Yes, 1.3A is a bit high.  For the first 5 minutes of the test it should be less than 1A.

Best bet is to follow the procedure in this post: https://www.porscheclubgb.com/forum/FindPost/964798

Richard
2017 Cayman S & Audi RSQ3
Previous:
1989 3.2 Carrera Sport, 2012 Cayman 2.9 PDK, 2006 Cayman S, 2000 996 Turbo, 1998 996 C2, 1994 993 C2
andrewmarston1
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Re: Battery Drain 2020/07/17 15:11:22 (permalink)
Thank you for the reply’s, it is most appreciate.
 
Kind regards
 
Andy

Porsche 996 Targa
BMW 125 M Sport (Daily driver)

C2dweller
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Re: Battery Drain 2020/07/17 16:24:39 (permalink)
I think the test conditions are important .  Lock down the latch on the bonnet with a screwdriver, lock the car and wait 5 mins.  You should see something about 0.25A or better.  You man need to calibrate your gauge too.
 
Don‘t just check it with the car unlocked and say ignition on.
 
kr Lee
 
 

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924nutter
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Re: Battery Drain 2020/08/02 03:29:30 (permalink) ☄ Helpfulby andrewmarston1 2020/08/02 10:48:57
I amp ish sounds like a 12 w lamp on. Have you looked through the vent in the engine cover to see if the light is on?  I hade a drain issue, and found out that either the bonnet switch or the engine cover switch can turn this light on and new switches are expensive. I took my engine bay lamp out
 

John Barnatt 924 register T/A

andrewmarston1
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Re: Battery Drain 2020/08/02 10:48:41 (permalink)
Thank you so much for that information, it has solved my problem.
 
When I had the new battery fitted the RAC man took out the bulb in the front trunk and then measured the current drain, not realising that the trunk catch also operated the light in the engine bay. (Giving the reading  of a current drain)
 
Thank you so much, this has saved me a lot of trouble.
 
Kind regards
 
Andy

Porsche 996 Targa
BMW 125 M Sport (Daily driver)

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