A Deaded Drain on w211

[ady74]

Opinions on my 2005 W211 petrol Merc. It has a intermittent Drain it can go for 5days and not drain then it can drain in a hour!!!! Its had a new battery and my Mercedes garage put a meter on a few times and showing no drain and nothing showing on the Star. He suggested it is a high chance its a regulator as says its common with these .Opinions please?

 

[mersum1es]

How much your alternator is charging? What is your battery condition? Bad battery can die fast... If it is ok you must have a huge current drain, which is weird in petrol car. Common culprit is that comand can be awake but draw is still max couple amps. Regulator diode fault is petty rare in these.

 

[ady74]

How much your alternator is charging? What is your battery condition? Bad battery can die fast... If it is ok you must have a huge current drain, which is weird in petrol car. Common culprit is that comand can be awake but draw is still max couple amps. Regulator diode fault is petty rare in these.

Alternator charging fine and battery 2 weeks old ,yes huge drain but intermittent so never know when its going to happen .hes fitting a regulator today but I'm not holding my breath.