C215 parasitic drain

[Craiglxviii]

2000 model year CL500, now showing a 3.4A drain as measured at the battery. A quick poke across the fuses doesn’t show anything alive. Anyone have any ideas where to start?

 

[Oldspanners]

Found this the best method, this guy gives charts to work out the draw across a fuse without pulling it out and waking the system up.
Well worth watching.

 

[Craiglxviii]

Thanks for that. This is tricky; no fuse is showing any voltage across it after the car has gone to sleep.

One thing left to try before I speak to the garage...

 

[Tony Dyson]

Have you tested in your Pre-Fuse box? do you have a Clip-On/Open Jaw DC Ammeter?

 

[Craiglxviii]

No I haven’t. I’m not brave enough to go poking around in there.

And no I don’t.

 

[Craiglxviii]

And solution... it is the voltage regulator on the alternator.

 

[bembo449]

I was going to suggest that craig

 

[LostKiwi]

And solution... it is the voltage regulator on the alternator.

Man that car likes to throw you challenges...