M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

What is the resting current for battery 2008 ML320 CDI?

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Old 05-10-2022, 11:58 AM
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ML320 CDI 2008 4JGBB22EX8A368386
Question What is the resting current for battery 2008 ML320 CDI?

I am showing just over 1A with the doors closed, everything switched off. I believe it should be well under 0.1A (perhaps 50mA).

Last edited by dwwaddell; 05-11-2022 at 08:55 AM.
Old 05-10-2022, 01:21 PM
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1A seems high. How long did you wait before taking your measurement? The numerous electronics may take some time before entering sleep mode.
Old 05-10-2022, 01:37 PM
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ML320 CDI 2008 4JGBB22EX8A368386
Originally Posted by Tsumi
1A seems high. How long did you wait before taking your measurement? The numerous electronics may take some time before entering sleep mode.
Probably only 5min or do. It looks like you're right and 30min seems more appropriate. I'll leave it longer and report back. I do suspect there are components sinking current though because of the large number of errors on the CAN Bus.
Old 05-11-2022, 10:46 AM
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ML320 CDI 2008 4JGBB22EX8A368386
After 30min there's no change and the resting current is 1.00A±4mA.

I read somewhere of a chart with current draws by various devices—does anyone have more information on this?
Old 05-11-2022, 12:58 PM
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This place is a joke.
MB spec is 50ma or less. Try locking the car and see if it changes after 30 minutes.
Old 05-14-2022, 03:00 AM
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2006 ML320 CDI (2 of) and 2008 GL320
Check that you have also clicked the latch in right rear door(so car thinks all doors closed). Or car may not go to rest properly.

Assumuming you have that door open to access battery.

make sure you don’t slam the door with the latch clicked or might damage stuff.

Old 05-15-2022, 01:08 PM
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ML320 CDI 2008 4JGBB22EX8A368386
As I started taking apart the driver's seat to get to the Central Gateway, I found about 6" of water in the well:

Some of it I could drain but the rest (several gallons) I removed with a Wet Vac:
Old 05-16-2022, 06:04 AM
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Definitely not pretty. Do you have a stereo amp as well in there?
Old 05-16-2022, 06:54 AM
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ML320 CDI 2008 4JGBB22EX8A368386
Unhappy Still working on removing the molding covering the well

Originally Posted by wannawagon
Definitely not pretty. Do you have a stereo amp as well in there?
I don't know what's under there yet (I do have surround sound audio). I am still working on removing the panel which is under the seat (see where the red arrows are as it seems to be tucked under everything: door weatherproofing, carpet under the pedals, door upright). After levering up one corner, you can imagine my surprise to find my hand in water all the way up to my wrist.

I live in Houston, TX so, at this time of the year we get a lot of thunderstorms with very heavy downpours. I am also parked next to a tree that has shed an incredible amount of blossom this year which, no doubt, is responsible for blocking the drains.

And, that is only from the most recent shedding of blossom.
Old 05-16-2022, 01:27 PM
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ML320 CDI 2008 4JGBB22EX8A368386
I finally removed the well cover (there was one more plastic 10mm nut under the door trim). There's all kinds of modules under there besides the CGW: rear audio, audio amplifier, and two more units I haven't identified yet. I will remove them all, open them up and dry them out.

Last edited by dwwaddell; 05-16-2022 at 05:06 PM. Reason: Fix
Old 05-24-2022, 08:39 AM
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e30 2000
Originally Posted by dwwaddell
I am showing just over 1A with the doors closed, everything switched off. I believe it should be well under 0.1A (perhaps 50mA).
How long did you wait before taking your measurement?





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Last edited by ahmedroyce; 05-24-2022 at 09:00 AM.

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