tracing a battery drain

jonnyboy

MB Enthusiast
Joined
Nov 27, 2005
Messages
2,562
Location
Camberley, Surrey
Car
1991 sl300-24 project,s124 280,w115 no interior, w108 project no engine
Hi all

Back in the uk soon and trying to get ahead of things not behind.
Electronics are not my strong point but I have a multimeter so here goes:-

I have a severe battery drain on my 300 sl24.
How can I trace the cause? I really dont know where to start...
TIA
 

Diesel Benz

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Joined
Feb 3, 2006
Messages
4,090
Location
Europe
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222.132 & 221.122 & 213.050 & 906.633
You could first define what "serious battery drain" means to you? Does the battery run flat overnight or in a week?

If your battery is good, I'd measure the quiescent current from the battery lead with a MM and would start pulling off fuses. Once the drain drops, you would have an idea where it comes (does not have to be the exact control unit).

Most likely there are typical consumers in your model, members familiar with this model could give accurate guidance for potential faults.
 

kth286

MB Enthusiast
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Feb 4, 2003
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Location
Caversham Berks
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E320 Coupe
posssibly micro switches in boot/door locks stuck.
 

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