Battery Drain
 

This is my first post in the forum. I bought a 2001 S500 8 months ago with 49,000 miles. I am having problems keeping the battery charged if not driven for a few days. I have replaced the battery twice now and continue to have the problem. I have heard that this is a common problem with S500's within certain years. Does anyone know how to resolve this? Thank you in advance for any suggestions.

RE: Battery Drain
 

check the alternator if its charging the battery. Then this is the hardest part you could have a power leak somewhere. Is there any aftermarket work done to car? NAV, radio? speakers? alarm? check those out. ur voltmeter is your friend.

RE: Battery Drain
 

I had my both Mercedeses sitting for 5 weeks and they started with no hesitation ON 7 YEARS OLD BATTERiES.
My friend installed aftermarket alarm on his MB and needs to charge battery every couple of weeks (it is his spare car) get battery maintainer.
$7.99 at Harbor Freight.
If you really want to do it, connect amp-meter between the battery and the car and start pulling the fuses. That will point to the direction of the current leak.

RE: Battery Drain
 

EIS, OCP, UCP and door control module current drain.

RE: Battery Drain
 

I have a 2002 s600 with 25,000 miles, the battery keeps going dead if i let the car idle at all, the car will die if it idles to long..
if any one can help, i have had the car to the dealer 4 times for this ...

RE: Battery Drain
 

Suggest you permanently wire in a modern "switched mode" trickle charger accross the battery.
Plug it in when you car is parked at home and you will never have a flat battery again.

Allan

RE: Battery Drain
 

the battery is good?

the alternator is charging well?