Battery Drain

1998-Present CLK200, CLK230, CLK320, CLK350, CLK430, CLK500, CLK55 AMG, CLK63 AMG, CLK DTM AMG
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Michel
C 111
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Joined: Mon 02 Oct, 2006 7:33 am
Model you own: w116
Location: Sydney, Australia

Battery Drain

Post by Michel » Sun 16 Mar, 2014 7:12 pm

My 1999 CLK320's battery goes flat after a few days being parked.
I thought the battery might have been on its way as it was more than four years old
So I bought a new battery and it's still doing the same.
Two days and it's dead as a door knob.

I called the electrician who checked it right through.
The battery is in excellent condition and there are no leaks in the car.

He reckons the alternator might have a faulty diode or two and thus is draining the power from the battery after being stopped for a day or so.

Any one encountered that problem?
Michel (in Sydney)

W116: 1978 690SEL # 3312
R107: 1985 500SL AMG - LHD
A208: 1999 CLK320 Convertible
C208: 2000 CLK430 Coupe

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Tony From West Oz
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Joined: Mon 20 Jun, 2005 10:04 pm
Model you own: w202
Location: Bedfordale WA

Re: Battery Drain

Post by Tony From West Oz » Sun 16 Mar, 2014 10:45 pm

If the Auto 'leccy said there were no "leaks" in the car, I presume that he meant that there was no current draw from the battery with the engine off. That would be apart from any radio memory, body computer, etc, etc currents. There should definitely be no current drawn by the alternator.

If the alternator had faulty diodes causing the battery to go flat, then this should have been tested by the 'leccy and eliminated, or confirmed, as the cause.

If there were faulty circuit diodes then the charging current would be low.
To test this with your limited facilities, (hopefully you have a multimeter) check the battery voltage with the engine at idle and the lights, A/C, fan and rear demister on. You should have more than 12V for a good battery.

Increase the engine RPM to 2K or more.

The battery voltage should rise to 13.6v or higher. Normally it should not rise above 14.5V unless you are in an extremely cold area.

If not, then go to a different Auto 'leccy.

I hope this helps,
Tony
Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

'83 W123 300D 325000km (Wife's car Josephine - sold).
'84 W123 300D replaced good OM617 912 with OM617 952 and enjoyed having good acceleration for the first time since first driving a 300D in 2002 - became engine and trans donor for 300CD Turbodiesel conversion. Now parted out.
'86 W124 300D sold (Wife's old car - sold )
'85 W123 300CD, 275 000km (Fatmobile) rebuilt turbodiesel from previous Fatmobile transplanted into 280CE (occasional tourer)
'99 W202 C250 Turbodiesel (my darling Wife's car - Sold)
'98 W202 C250 Turbodiesel (my car - Sold)
'06 Ssanyong Musso Crew Cab 2WD Ute (OM662 diesel and Auto Transmission)

redlaser
Finnie
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Joined: Tue 02 Jun, 2009 5:38 pm
Model you own: w126
Location: Narre warren Melbourne

Re: Battery Drain

Post by redlaser » Mon 17 Mar, 2014 8:45 am

U must have a battery drain somewhere...disconnect the battery positive lead and connect an ammeter in series..there shud be less than 30Ma drain current (10-15ma is usual)...for an overview, read the excellent article on battery "parasitics" below:
http://www.diagnosticnews.com/parasitic-battery-drains/

KimB
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Location: Sydney

Re: Battery Drain

Post by KimB » Mon 17 Mar, 2014 10:26 am

We had the same problem in both our 300SE's. In both cases it was the car alarm draining the battery. After it was disconnected the batteries were fine.

Cheers
Kim
W126 86 300SE Champagne
W126 84 380SEC Signal Red

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T-Modell
SLS AMG
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Location: Weinheim / Germany
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Re: Battery Drain

Post by T-Modell » Mon 17 Mar, 2014 6:39 pm

I'm not joking now: Climb in the trunk, see if the light goes off. Are the indoor lights permanently on by accident? Happened to me with the W111 :banghead:

Thomas
---------------------------------------------------------------
1967 W111 250SE Cabriolet, horizon blue
1973 W115 220D 5.0 Pick-Up Argentina, work in progress 2017/18
1986 R107 500SL, arctic white, the midlife crisis viagra replacement
2007 R171 SLK350, calcit white
2008 S211 E63T, calcit white, sleeper

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AMG
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Re: Battery Drain

Post by AMG » Mon 17 Mar, 2014 6:50 pm

T-Modell wrote:I'm not joking now: Climb in the trunk, see if the light goes off. Are the indoor lights permanently on by accident? Happened to me with the W111 :banghead:

Thomas
Just remember to make sure you don't lock yourself in there.... :king: :pale:
Current:
1987 560SL 4sp. auto Signalrot "Stella"
1987 190E 2.3-16 5sp. man. Blauschwarz "Hermann"
1992 300CE-24 6sp. man. Perlblau / Iceblau "Gretel"
1992 Range Rover Vogue SE 4sp auto Ardenne Green "Oswald"
2012 Renault Sport Megane RS265 Trophy 8:08 6 sp. man. Liquid Yellow "Jean Rédélé"
Previous:
1986 560SEL Anthracitgrau "Schultz" - In Mercedes Heaven
1987 190E 2.6 4sp. auto Signalrot "Sabine" - which now resides/owns Andrew M's Garage
1972 350SLC Astralsilber "Lurch" - now in the loving care of Craig B
1989 2.5-16 Blauschwarz 4sp. auto (parted) formerly owned by Derek/Hasan.

john6007
Dernburg Wagon
Posts: 5
Joined: Thu 17 Dec, 2009 10:17 am
Model you own: w116
Location: Perth / York Western Australia

Re: Battery Drain

Post by john6007 » Mon 01 Dec, 2014 12:22 am

I can only agree with the comments posted:

"You must have a battery drain"

"The car alarm" These have caused me to pay for far too many batteries (now over 10). Now I just disconnect the terminals. A pain but your battery will last for 10 years. I generally don't park my cars in areas where they are likely to be stolen so the alarms are a pain in the ass. If you drive the car every day no problem, if you have a selection put the right size spanner in the car and just disconnect.

Hope this helps.

John
79 450 SEL 6.9 (115k's)
79 450 SEL 6.9
88 560 SEC
89 Ducati 906 Paso (30k's)
92 300CE-24 Sportline
98 MX-5
01 CLK320

KimB
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Joined: Thu 20 Dec, 2007 5:57 pm
Model you own: w126
Location: Sydney

Re: Battery Drain

Post by KimB » Mon 01 Dec, 2014 10:37 am

john6007 wrote:I can only agree with the comments posted:

"You must have a battery drain"

"The car alarm" These have caused me to pay for far too many batteries (now over 10). Now I just disconnect the terminals. A pain but your battery will last for 10 years. I generally don't park my cars in areas where they are likely to be stolen so the alarms are a pain in the ass. If you drive the car every day no problem, if you have a selection put the right size spanner in the car and just disconnect.

Hope this helps.

John
Just a side note to the alarm. Although we had alarms in our 3 w126 cars, we never bothered to activate them.
They were all fitted by the prev owners. The only precaution I take when leaving the car parked is to open the glove box.
This shows that there is nothing of value there.
To prove my point, we parked in a city car park many years ago. 12 cars that were parked alongside ours were broken into and ours was left untouched.
The only thing we did with the alarms was to rip them out when they started to drain the battery.
W126 86 300SE Champagne
W126 84 380SEC Signal Red

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