Q: Alternator is not working and the instrument lights are out.

asked by on December 21, 2016

my car was stalling most of the time and shaking and the car became idle almost at every stop. now the car starts but the instruments lights are off, is necessary to have a diagnosis to pinpoint the real problem with a Mercedes-Benz diagnosis tool. The problem started.After I replaced the fuel pump, Mercedes-Benz dealer told me that the fuel pump was not working so I replaced myself. The alternator is not working but I have the part.

My car has 150000 miles.
My car has an automatic transmission.

Warning Light is on Inspection $79.99 - $99.99 Get a Quote

If the charging system is not working, that is something that needs to be corrected first. Your car has a whole network of computer modules that will behave very strangely if the system voltage is not correct. Once you have the charging system working right is the time to run a diagnostic with the Mercedes SDS. You’re right in that a conventional diagnostic scanner is not going to do the trick. I wouldn’t spend any time trying to work out the instrument light thing until running the diagnostic. You can contact your mechanic and have a technician come to your home or office to check out your car and tell you if any of these problems are related and what it may take to fix them.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Hello, when I press gas pedal It won’t go I have to press it all the way down and takes a couple seconds to go, RPM needle bounces and makes a force engine noise when driving it.

Well it ran cold started making a ticking sound then couldn’t press the gas pedal it stopped working wheel seemed like it locked and when tried to restart makes loud clunking noise

My 2001 honda accord it wont go foward or reverse it was driving good but it just stopped going foward i thought was the oil and i put three of the [transmission](/topics-transmission-honda/) oil but it didn't do nothing so what else could be?

Turns over but won't start.. 2001 Chevrolet Blazer

Claimed by David Gaines Wooten

I was driving in the rain and when i went through a dip full of watter, water splashed into my car n got my feet all wet... the wa

Vehicles are far from waterproof in all circumstances. When the vehicle is designed the structure is engineered to keep rain out and most water sprayed from the wheel well areas but if you enter standing water of significant depth, some...

I need a alternator my Vin is 1GCGK23U44F245647 could you tell me if I need a 105 or 145 amp

Assuming the alternator is original, and thus has never been replaced or substituted with a part that is non-original, you can quickly tell which one you have by reading the tag on the alternator. You will see a tag that...

My car reduced speed and increase at the same time even on the motion

Hi there. The description you have given, appears to be a fuel starvation issue. Surging and bucking upon acceleration could be a fuel pump problem. Not knowing what year your Toyota is, it may have an external fuel filter that...

My coolant is boiling out of my overflow tank.

This is most likely the result of a failing fan switch relay or a failed thermostat. The thermostat is a component that regulates the flow of coolant through the motor based upon specific temperatures. When the engine reaches a certain...

My friend's car is vibrating

The symptoms you described do make it sound like an issue with the torque converter. It sounds like, while you're driving, the torque converter lock up clutch is slipping occasionally, causing the vibration to happen. It is possible that there...

Related articles

How the Alternator Works in Your Car
Your Your car alternator, at its most basic, is what works along with your battery and the rest of your charging system to keep your car running. When you start your car, you’re running on battery power. Then the battery...
The Best Used Cars to Buy If You're a Rock Climber
If If you’re a rock climber, you want a vehicle that gets you where you need to go, even if the terrain gets rough. You may be living out of your vehicle at times, so you also want a rig...
A Buyer’s Guide to the 2012 Mercedes Benz S-Class
If If you’re looking for a vehicle that delivers top-of-the-line features, comfort, performance and safety, all while showing off the prestige of the driver, the 2012 Mercedes Benz S-Class is your choice. Key Features With Active Body Control and...