Help.....Cripes...
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c63 AMG
Help.....Cripes...
The car hadn't been started in a week and yet started up beautifully. After about 15 minutes of heavy traffic all at once my dash board light up red as seen in the diagram showing me the picture of a battery. I pushed the button "ok" and the red disappeared however was saved in the "service messages" section. My Bluetooth and radio LCD closed and the buttons surrounding the cd section turned off. I continued driving the car for another half hour until I returned home. I shut of the car and restarted. After 30 seconds the battery light lit up again. I have the tester seen below and the car tested as follows 1. The alternator tested ok (Diode Trio Functioning.) 2. Battery Load test was 11.3V (above 10V is good.) "Charging Test" after 10 seconds was 14.18V (between 13.5 and 15.5V is normal.) All of these readings look ok unless this is not applicable to Mercedes. I have had for the last two weeks a dash cam connected to the cigarette lighter even while the car is turned off; however, it shuts down when I turn off the engine. I was told that perhaps it is my secondary or auxiliary battery that caused this. Do I have one?
Guys my unit is stationed in the far east; dangerous to be stranded out. Please help
Guys my unit is stationed in the far east; dangerous to be stranded out. Please help
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I keep telling people that you gotta change out your battery every 4-6 years regardless. Just got to. If its premature power loss you gotta look at your alternator...
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c63 AMG
Hold on; I have under the hood??!! Where? The one in the trunk I changed 5 months ago. I don't see anything anywhere saying that the 2009 has this aux battery.
Last edited by shamrode; Feb 24, 2016 at 07:00 PM.
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A battery under hood and one in the trunk, right side or passengers side, under the floor board.
The one under hood is on the passenger side also if I remember correctly. It has a red terminal top.
The one under hood is on the passenger side also if I remember correctly. It has a red terminal top.
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WTF are you guys on about?? There is a boost terminal under the hood, but there is only one battery in the trunk. Where exactly is this concealed battery, please?
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Exide search example.
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Guys - what you've got there is just the boost (jump) terminal. Up and to the left (under the large cover) is the cabin air and below that the ECU. There is no aux battery.
Agree that the symptoms point towards an alternator or voltage regulator issues.
Agree that the symptoms point towards an alternator or voltage regulator issues.
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The Bus
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c63 AMG
How can one determine whether it is voltage regulator or the alternator? My tests from my first post showed all was good. Could my dash cam that is connected to the lighter cause issues?
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Makes sense. My apologies shamrode.
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If you are doing a lot of short distance driving or not driving the car for long periods I'd consider hooking the car up to a battery tender or trickle charger. I had one of those silly progressive data things on my car for a couple of days then didn't drive the car for a week. This thing has no shutoff and ate my battery up (down to like 9v). The Batteryminder brought it back from the dead. This may be what's happening with your dash cam even though you think it's shutting off.
Last edited by realjones88; Feb 25, 2016 at 03:44 PM.
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c63 AMG
If I go to a Mercedes dealership and they connect the car to their scanner can it tell me what caused the error even though it is in the past? Does the car's ecu retain error history? Also how does one determine whether it is the voltage regulator or the alternator that is the culprit?
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Shamrode - unless the dashcam connector in the lighter socket is faulty and shorting out, the issue could be anything from a bad ground connection (although unlikely) to a problem with the alternator, voltage regulator or the battery itself.
Specific error codes as to what went wrong will be stored in the ECU - do you have an OBD II code reader (scanner) by any chance?
Specific error codes as to what went wrong will be stored in the ECU - do you have an OBD II code reader (scanner) by any chance?
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W204 C63 Coupe, W166 ML350 BlueTEC, 928GT, Taycan GTS Sport Turismo, C5 Z06 & IS300 race cars
If I go to a Mercedes dealership and they connect the car to their scanner can it tell me what caused the error even though it is in the past? Does the car's ecu retain error history? Also how does one determine whether it is the voltage regulator or the alternator that is the culprit?
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c63 AMG
Thanks for the reply. I just bought an obd2 connector made by Elm (elm327.) I connected it to the OBD port and scanned for error codes and nothing came up. The question is if the car is no longer showing the red battery light if the elm scanner will pick something up in the ECU history. It did give me a po365 fault code. Any clue what the code is?
Last edited by shamrode; Feb 26, 2016 at 07:54 AM.
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‘04 996 C4S, ‘18 GLC, ‘19 Alltrack
