Even if the battery cables look new , take them off and use a wire brush to clean them, battery post or mount too! a battery can have a clear gel film on its contacts that you can not see but will prevent a full 12v from reaching the starter, just clean both pos and neg parts that connect to the battery well and you will see.
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The brake light switch is tied to the ignition system.
Check your brake light switch. very common problem.
Follow the brake pedal up until you see it. small electrical part with connection to it.
Make sure to get a "real" Mercedes replacement part, as the aftermarket ones are even flakier than the dealer ones.
They are not that expensive and it's pretty easy to replace yourself.
Hope this helps!
Are the lights on the dash on or not?
if yes check your grounds what you can find.Mainly at the battery.It could also be the electrical part of your ignition switch,
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You mean you try starting it, and it just clicks? That means your battery is dead, and you need to charge your battery, jumpstart your battery, or if it's the original battery it may be time to replace the battery.
Further clarify electric leaking? You mean that when the vehicle is off, somethine is still drawing power, draining your battery?
If so, turn off the vehicle, and go around making sure ALL your lights have turned off.
Battery drain is sometimes a hard thing to trace. It could basically be any wire on your vehicle.