Benz C240 4matic battery draining
09-19-2024 | 10:30 PM
#1
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Joined: Sep 2024
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From: Abeokuta
Benz C240 4matic
Benz C240 4matic battery draining
Good day pls help me with my car c240 battery draining overnight, what can really cause the because I just get new battery and it drain the battery within 3day is because the battery is new and I have change the Fuse SAM too and is still the same pls help me out.
09-21-2024 | 03:45 AM
#3
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Joined: Apr 2009
Posts: 212
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w203cl
Check if you find a broken module: Open hood, trunk, driver dorr to get access to the fuses. Wait 10 minutes (do not touch the car), take a multi meter with millivolt measurement and measure all fuses from the top. If you find a fuse wich has 0.1 mV or more, that is too much current on the fuse.
Next test: Open the hood, wait 10 minutes (do not touch the car) remove the negative cable at the dome passenger side. Take a multi meter, use cables with clamps and in the 20A port, reconnect the battery over the multi meter and watch it. After 5-10 minutes it should go down to 100+ mA and after 30 minutes down below 20 mA.
Next test: Open the hood, wait 10 minutes (do not touch the car) remove the negative cable at the dome passenger side. Take a multi meter, use cables with clamps and in the 20A port, reconnect the battery over the multi meter and watch it. After 5-10 minutes it should go down to 100+ mA and after 30 minutes down below 20 mA.
