Is this really The problem
The problem is when an S class needs to be jumped the battery is stone dead. With all the electronics (auto doors , auto lights , air suspension / compressor) you need a good strong charge in the battery. You could drive for an hour and barely recharge the battery after it died.
When you go dead you really need to hook the battery to a battery charger and get a real full charge. Then see how it plays out from there.
I think it will probably solve your problem as I have had this problem , and others recently in the forum.
LR





