I bought the new battery last week because my old battery were keep on drainig overnight and the car wouldn't strat in the morning. The problem satill presits with the new battery as well. I have got the alternator and battery check they both are fine!! Don't understand what's going on?
You have a slow drain of power inside the car wiring. It could be a relay sticking closed, a short to ground somewhere, or a component using power when it should be switched off like a courtesy lamp.
The fuses have to be pulled to find the circuit with the drain.
SOURCE: battery keeps dying on 2001 c 240
YOU PROBALLY HAVE A NEGATIVE POWER DRAW TO CHECK THIS USE A TESTER LIGHT AND CLIP THE WIRE TO THE POSITIVE SIDE OF BATTERY AND TOUCH THE NEGATIVE BATTERY TERMINAL IF IT LIGHTS UP U HAVE A NEGATIVE POWER DRAW
SOURCE: battery on mercedes A140 drains. I drove the car
aftermarket stereo? dome lights? car alarm? Use a multimeter and see what fuse has power draw when car is off.
SOURCE: Mercedes S430
When you shut the car off something is staying on in the vehicle, causing a current draw on the battery, causing it to go dead over night. something that would cause this would be like a under the hood light, trunk light, interior light staying on. visually check it. and if you don't find anything you might want to buy a fluke/ volt meter, to check for unwanted current draw when the vehicle is off. your local mechanic could help. it could become more extensive then this but most likely not by the sounds of it.
Testimonial: "Thank you. I will try this out."
334 views
Usually answered in minutes!
×