Its probably the alternator. Take off your alternator and take it to autozone and they'll test it for you for free.
If it's not the alternator--check the fuel relay and fuel filter.
I had that problem on my 1998 190E. It started by losing power on occasion and then more often, until it quit altogether. Each time the battery seemed to be drained. I actually carried a spare battery around for a while. Changing the battery seemed to correct the problem (for a while). I had the alternator checked and took it to 2 "Mercedes specialists". It actually was the fuel filter and fuel relay. It wasn't something the first 2 mechanics thought about. Hope this helps.commentI've been having the same probs with my '91 190e, but only when i uuse the a/c. new alt and battery hasn't helped. I'll be changing battery cables soon.
Could be the life of the battery has expired or the charging system is faulty or the vehicle has a draw on the system killing the battery when not running. Drive the vehicle to your local auto parts store. They will test the battery and the charging system at no cost. Battery is bad or something is draining it. Most places that sell batteries can check it. With it charged, disconnect it and see if it holds a charge. If it does, something in the car is draining it. Dead cell in the battery or something is on drawing power from the battery.
Either the battery has a dead cell and needs replacing or something is on pulling power from the battery.
Change the abs motor.
Dead cell in the battery requiring a replacement battery or something is on pulling power from the battery. Can be any light on the car or any relay.
You left the light or something on last night and ran out the battery or your battery died
Something is on drawing power. Can be any light on the vehicle or a relay stuck.
Possibly the alternator is defective and not recharging the battery. Or something is on, pulling power from the battery when the car is not running. Can be any light or any relay that is stuck.
Weak alternator, dead cell in the battery, or something is on pulling power from the battery when the cars is not running.
on a 1990 cadallic sedan de ville after you cut the car off the blower keeps running killing the battery
check you fuel pump relay
Your putting a charge on the battery when its running.
If the battery is running down if it sits for a long period of time then either something is on that is pulling power from the battery or the battery has a dead cell. Check the under hood, glove box, trunk, & interior lights. Also check the brake lights. In rare cases it can be a stuck relay such as a power window relay. If it has a dead cell the only fix is to purchase a new battery. That one dell cell will continually run the battery down.
Your battery is going bad and something may be draining the battery. If you have a weak battery, it will lose charge. The car charges your battery when you run it and if you dont run it, it will go dead. If your car dies while running, in that case you might need a new alternator.
Bad Battery. Bad Alternator. Lights left on by mistake. Something left running. Exc.
If it is running on the battery only then that means the alternator is not charging the battery.
A light in your car might be on, running down the battery!!
something else must be running when the car is off besides the clock.
Something is discharging the battery when it is not running. Have the electrical system checked.
Leaving something on (like headlights) for an extended amount of time without the engine running will shorten the life span of the battery unless the battery is the deep cycle type. Overcharging an automotive battery will also shorten its life span.
Overcharging, running it down over and over, dead cell in the battery, or something left on in the vehicle, such as any light or stuck relay.
A battery is used to start a car. Once it is running, the alternator then supplies electrical energy to charge the battery as well as power the electrical systems in the car. Removing the battery while the car is running will not affect the running of the car.
Running, chasing, killing.
you have a ground somewhere
No , for the battery to be charged the engine must be running . This means that your alternator , if it's functioning properly , is charging the car's battery as the engine is on/running .