Hi,

after much work already - can anyone advise plz.
I have 1999 C280 W202 (112 engine) in excellent condition except for battery drain. I've searched posts for ideas and learned plenty but not found solution.
The battery charges fine and holds charge when disconnected. When connected I measure about 5 amps draw at the battery terminal. I've disconnected all the fuses from the three boxes very methodically. Have disconnected the alternator (both terminals), and still get the same current draw. I've been inspecting cabling and not found any problems yet. I measure only a few Ohms resistance between X3 terminal post and local chassis earth (with alternator disconnected)- so there must be a near short somewhere. I'm suspecting faulty capacitor C2 in X4 under drivers footwell carpet. Like I said - I think I've eliminated most other things.
Could you suggest where I might look, what I've overlooked, and how to test,
thanks.