xabo

2008 CL65 with the 2 battery system. Lately I've been having a battery drain problem. Normally if I cannot unlock the doors with the key fob it's a result of the rear battery being drained from the car sitting for a couple of days. I could connect a battery pack and the car would start.
Yesterday same situation only this time after jumping with the pack, car wold not start. No click, nothing.

Connected the pack to the starter battery in the front battery and car started. Drove for about an hour on the freeway, came home and parked. Turned the car off and tried to restart and nothing. This leads me to believe that the front starter battery needs replacing (have had it for for about 8-9 years). could the bad front cause a drain of the rear battery? The rear battery is about 2-3 years old.

mcypert

xabo:

I don't think the rear batt will drain the front, and vice versa... I've been through 3 starter batt's in 8 years , but probably have the original truck batt (16 years!!).

Here's a link on a starter batt replacement:
https://mbworld.org/forums/s-class-w...placement.html

Hope this helps... Mark

BOTUS

sounds like you need two new batteries - but would be worth checking the alternator output - when BOTH batteries fitted are good working units behaving - not with two dead or dying ones

BenzNinja

iTrader: (4)

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batteries must be replaced every 3.5 years if you don't want problems on a S