This is a detailed video outlining the differences between cheap and cheerful clamp meters, and more expensive professional clamp meters to monitor parasitic battery drain. The video goes on to show how a thermal imaging camera can be used to find a parasitic battery drain caused by a component without a fuse.
If you have a battery drain on your SL, it can quickly ruin your battery especially if this is not your daily driver. This is because storing a battery at anything less than full charge, causes it to start sulphating. A sulphated battery wont hold its charge and runs down more quickly. At 12.2v your battery is 50% discharged! - at 11.75v the battery is deemed to be fully discharged and you'll get the 'consumer electrics offline' error. Leave it like that for a few weeks and your battery will be ruined.
Негізгі бет Mercedes SL55 AMG R230 battery drain - finding a non fused parasitic draw using clamp meter
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