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I checked Amp this morning on the way in.
It hovered around 20A for the first ten minutes of driving (heat on, radio on) then when I got on the freeway it went steadily down and did not go above 6A for the duration of the drive, about 30 more minutes.
Voltage was pretty much the same as last night.
That 20A is high but not bad as if 50A or more.
Your test drive shows battery was discharged and then got charged all the way to 6Amp.
Alternator and battery are proven working.
> Check/clean/protect main chassis GND strap undercarriage. This is what connects the battery (-) and all the computers to the ALT (-) source at the engine.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Originally Posted by Aging C300
Yeah, I checked my records and it looks like the transmission oil was not changed at 120k when it was supposed to be. I'm at 133k now so may just have it done and test the battery while I'm at it.
FCP has tranny service kits. You may find a shop that lets you provide the parts and pay only for labor. My Mercedes dealer does that for me. Last tranny service cost $300 in labor and the tranny service kit was about $200. The good thing is that the next time you service the tranny and buy the parts from FCP, you will get refunded when your return the used parts, that includes bolt, filter, stand-off pipe, pan gasket, and fluid! Damned good deal.
I tried the fuel filler door when the car is locked and the little door is locked unless I unlock the car.
Before filling up I got out and locked my car and checked the flap and IT WAS UNLOCKED. So yeah, it does in fact look like it isn’t locking any more. It closes— but doesn’t lock.
I listened to mine and can hear it locking/unlocking after the doors lock/unlock. Try listening to see if you can hear the actuator trying to move at least. You may get lucky and its just an alignment issue. Try locking with the filler flap open while listening.
I tried to look through the trunk but couldnt see it, its hidden behind insulation. I think it is meant to be removed from the trunk, I could be wrong though.
I found an actuator on ebay to see how it works. Looks like it is clipped into the surrounding. I havent located a mercedes part# so not sure its meant to be replaced if its broken or they sell you a complete assembly.
I wonder if the actuator can be function tested on a mercedes obd scanner. That is how i found my mirrors were heated, I stumbled upon the function to test it.
i experienced this before, as my mechanic said w204 problem are almost all identical :
1. ECU
2. Alternator
But in my experience, this is likely alternator issue, because your alternator is failing, and cannot supply electricity to your battery, voltage drop, and cannot sustain the car, and the car went limp mode, should the steering wheels feels stiff to operate, and all your dashboard light up like christmas tree, i suggest u use the mdi in your car to check, use turn off phone + OK button to check before starting the engine, the "vehicle data" should display in your dashboard, click, and start the car..
if voltage is 12.4v or lower, and ampere is -20A and below, it is alternator problem
I listened to mine and can hear it locking/unlocking after the doors lock/unlock. Try listening to see if you can hear the actuator trying to move at least. You may get lucky and its just an alignment issue. Try locking with the filler flap open while listening.
I tried to look through the trunk but couldnt see it, its hidden behind insulation. I think it is meant to be removed from the trunk, I could be wrong though.
I found an actuator on ebay to see how it works. Looks like it is clipped into the surrounding. I havent located a mercedes part# so not sure its meant to be replaced if its broken or they sell you a complete assembly.
I wonder if the actuator can be function tested on a mercedes obd scanner. That is how i found my mirrors were heated, I stumbled upon the function to test it.
I left the fuel filler flap open while locking and unlocking and looked at what I think was the little locking mechanism and there was no sound or movement.
i experienced this before, as my mechanic said w204 problem are almost all identical :
1. ECU
2. Alternator
But in my experience, this is likely alternator issue, because your alternator is failing, and cannot supply electricity to your battery, voltage drop, and cannot sustain the car, and the car went limp mode, should the steering wheels feels stiff to operate, and all your dashboard light up like christmas tree, i suggest u use the mdi in your car to check, use turn off phone + OK button to check before starting the engine, the "vehicle data" should display in your dashboard, click, and start the car..
if voltage is 12.4v or lower, and ampere is -20A and below, it is alternator problem
Yes, there is a lot of positive truth to that.
Where I differ is I bet 95% chance ALT is fine.
The cause is remote... the SAM modules are reliably unstable ---> REBOOT + GND campaign.
> The most IMPORTANT IS TO BE SAFE:
-- Keep an eye on battery display while driving !!
-- Turn ON HL to force a fixed 13.7V voltage
-- Float-charge battery to preserve it
Last edited by CaliBenzDriver; Feb 24, 2024 at 05:35 PM.
The cause is remote... the SAM modules are reliably unstable ---> REBOOT + GND campaign.
> The most IMPORTANT IS TO BE SAFE:
-- Keep an eye on battery display while driving !!
-- Turn ON HL to force a fixed 13.7V voltage
-- Float-charge battery to preserve it
HL = headlights?
it looks like float charging requires me to remove the battery from the vehicle…?
Last edited by Aging C300; Feb 24, 2024 at 09:06 PM.
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