Question about Mercedes-Benz E-Class

1 Answer

EVERY MORNING MY BATTERY IS DEAD OR NEAR DEAD THE PROBLEM STARTED A COUPLE OF MONTHS AGO WHERE I WOULD (ONCE IN A WHILE) GET A LOW BATTERY MESSAGE IN THE MORNING. THIS BECAME MORE FREQUENT SO I REPLACED THE BATTERY. DIDN'T HELP. NOW HAS GOTTEN TO WHERE IT DEAD EVERY MORNING. I'VE THROUGHLY CHECKED FOR SOMETHING LEFT ON. WHAT COULD BE GOING ON THAT GOT WORSE OVER TIME. I DID ADD A BLUETOOTH ADAPTOR IN THE M.O.S.T. RING, BUT THE POWER TO THAT IS ON THE FRONT CIGERETTE LIGHTER AND I KNOW THAT GOES OF WITH THE KEY, PLUS THIS BEGAN BEFORE THAT.

Posted by on

  • oldfarmer877 Mar 26, 2011

    I HAVE PLACED AN AMP METER IN SERIES WITH THE BATTERY AND CABLE AND SHOWS ABOUT 5 OR 6 AMP DRAW. WHAT MAKES THIS DIFFICULT IS I CAN'T FIND A WAY TO SHUT OFF THE TRUNK LIGHTS WHILE TESTING AS THAT IS WHERE THE BATTERY IS. BUT STILL SEEMS A LOT OF DRAW FOR TWO SMALL LIGHT BULBS. ANY THOUGHTS WHAT RELAY MAY BE STICKING? I SUSPECT YOU HAVE SOMETHING THERE AS THE PROBLEM GOT PROGRESSIVELY WORST WITH TIME AND I HAVE HEARD A BUZZING NOISE THAT SOUNDS LIKE IT'S COMING FROM THE DASH TO THE LEFT OF THE STEERING WHEEL.
    I'M GOING TO START PULLING FUSES NOW, I'LL LET YOU KNOW WHAT I FIND.
    ANY MORE THOUGHTS WOULD BE HELPFUL...THANKS

  • oldfarmer877 Mar 26, 2011

    CLAY: FYI
    I DISCONNECTED THE MOBRIDGE BLUETOOTH FROM THE M.O.S.T RING FIBER OPTICS
    AND CONNECTED DIRECT AS IT WAS ORIGINALLY AND THE DRAW DROPPED TO ABOUT .O2 AMPS, ABOUT NORMAL TO HOLD THE CLOCK AND COMPUTER MEMORY GOING. I DIDN'T THINK THE OPTICS WOULD HAVE ANYTHING TO DO WITH A AMPERAGE DRAW BUT I GUESS IT DOES. WHEN THE IGNITION IS SWITCHED OFF IT KILLED POWER TO THE MOBRIDGE TELEPHONE ADAPTER WHICH NEEDS CONSTANT POWER TO SHUT DOWN THE M.O.S.T. RING TO SIGNAL THE OTHER THINGS ON THE RING TO COMPLETELY SHUT DOWN ON THE BACK SIDE OF THE COMPUTER, WHICH IS NOT FUSED. I CONNECTED THE ADAPTER TO A CONSTANT VOLTAGE SORCE WHICH ALLOWS FOR A CONSTANT POTENTIAL THUS LETTING OPTICS THROUGH AFTER IGNITION OFF AND LETTING THE RING SHUT DOWN AND TIME OUT, SO IN ABOUT 10 SECONDS I SEE THE DRAW DROP FROM 3.75 AMP TO .02 AMP WHICH WILL TAKE A LONG TIME TO KILL THE BATTERY. MAYBE THIS INFO WILL HELP YOU TO HELP SOMEONE ELSE THAT MAY RUN INTO THIS.

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 2,841 Answers

If you know 100% that there is no light on such as under hood, glove box, trunk, interior dome, vanity mirror light, brake lights, or any other lights, then I suspect you may have a relay stuck. To find out if something is pulling power from the battery disconnect the negative cable and pull the fuse for the radio and clock. Even though the radio may not work with the key off, the presets are on another circuit and are pulling power. Now use a volt meter set to the 20 volt DC range. Touch one probe to the negative battery terminal and the other probe to the negative battery cable. You should read no voltage. If you do see voltage flowing something is on. Start pulling fuses one at a time while someone else watches the volt meter. When you see the voltage disappear then you have found the culprit. If after pulling all the fuses you still see voltage flowing then more than likely you have a bad diode in the alternator and the alternator needs replacing. If you pull a fuse and the voltage stops then you have found the circuit pulling power. You then have to figure out what is actually on that circuit which can be a relay sticking as in the power windows, power seats, etc. This is not an easy process and takes time and patience.

Posted on Mar 26, 2011

  • NOT ME Mar 26, 2011

    Remove the light bulbs in the trunk to prevent them form altering the results. The buzzing on the left side of the dash sounds very suspicious. Find out what that is and you may find your problem. Sounds like it may be a relay.

  • NOT ME Mar 27, 2011

    Thanks for the information, I did not think that was the problem as you indicated it began before you connected the adapter, but it seems you have solved the problem. A .02 amp draw would not run the battery down overnight or even in days. Seems you have a handle of it and should be good to go.

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

1989 ford 150 jamboree won't start new battery won't even turn over


Possible dead spot on starter. Try rapping on the starter with a piece of wood.

Dec 26, 2014 | 1989 Ford F 150

1 Answer

Stalls losing electric power


How old is the battery & have you tested it?
How is it that a month went by & your using
any vehicle that could let you down?
Why have all issues not been resolved ,as soon
as they started?
Have you checked for codes?
Have you had a professional scan tool on it
& checked data,that has to be done along with
many other checks or tests,unless it's just a battery
issue.
No one can solve any vehicle issue over the internet
There is always more to the story & you need the patient

Jul 19, 2013 | 2004 GMC Envoy

1 Answer

I have a 1995 Jeep Grand Cherokee with a 4 month old battery.A couple of the power door locks quit working a while back and my husband went out a couple of days ago and sprayed them with WD 40 but they...


check the voltage on the battery with a volt meter, it should be around 12.6 to 13 volts, if not charge battery with a charger, after charge try to start vehicle, if the vehicle starts use your volt meter at the battery again, the voltage should be around 14 to 14.5 any lower and the battery isn't being charged and the alternator should be checked and or replaced to solve the problem..

Feb 28, 2011 | 1995 Jeep Grand Cherokee

1 Answer

Engine wont start. oil pressure low warning when turn key.


I assume you check your oil, at least once every month, on a nice
sunny saturday morning
What else can you add,I sense there is more leading up
to this!
Is the battery low or dead?
If the engine is not running and the key is on,you get lots
of lights on the dash until it starts

Nov 30, 2010 | 2005 Ford Explorer

1 Answer

Battery on my 1999 Grand Marquis went dead a few months ago. There was no indication of battery losing its charge. The battery light never came on. I replaced the battery and things worked fine for a few...


Well the way I approach these situations, regardless of the make, is to get an ammeter in line with the positive cable and the positive battery terminal. With the ignition off there should be a very low current drain to keep the clocks, theft stuff, and door lock remotes (if equipped) enabled. So with the ammeter in place pull one main fuse after the other and see which fuse's removal causes the current to fall to a very low level. Now see what doodads are on that fuse and disconnect them one at a time until you have disconnected the feature which causes the current drain to fall down to nearly nothing. That is your bad guy. Usual suspects are trunk and glove box lights, power door locks, air ride suspension pumps, and the electrics which turn them on and off. Good Luck

Aug 04, 2010 | 1999 Mercury Grand Marquis

2 Answers

My 1999 yukon wont start i changed master air flow


Fuel pumps are real common to go out on those vehicles

Mar 15, 2010 | 1999 GMC Yukon

1 Answer

Intermittent dead ignition to dead ignition


This problem is usually caused by a failing neutral safety switch. Try moving the shifter when it is dead. Will it start in neutral? Move the shifter while trying to start (foot on brake!)

Jul 14, 2017 | 1991 Acura NSX

1 Answer

STARTING PROBLEM


If it is a really fast "whir" sound then it sounds like your starter has a dead spot.

Dec 05, 2008 | 1984 Ford Escort Gt

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

92 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercedes-Benz Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22114 Answers

yadayada
yadayada

Level 3 Expert

75797 Answers

Michael Contreras
Michael Contreras

Level 2 Expert

166 Answers

Are you a Mercedes-Benz Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...