Batteries are neither positive nor negative ground. It is the circuit itself that determines the common ground.
For example: If I have two circuits, one needing 6vdc negative ground and the other needing 6vdc positive ground, the battery would be installed the same way in both circuits (positive terminal on the battery to the positive connection in the circuit, regardless of whether the circuit is positive or negative ground).
The reason for labeling the ground as Positive or Negative has more to do with how the circuit is wired up, than the actual voltage source. The explanation for that is beyond the scope of this answer.
The battery in the SL500 is located in the trunk. There is a positive jump port under the hood and you can use any other metal under the hood as a ground. Mercedes Puts the battery in the trunk to reduce possability of an acid spill in an accident.
the trunk.
The battery is in the trunk, far right side under a removable panel.
cant open the case to get to the dead batteries. How do I open the case
I have a 1993 300sl and the battery is in the trunk on the passenger side. There is a knob that has to be twisted out and the wll of the trunk should pop out revealing a car battery. Its not that hard. Hope this helps.
in the trunk, passenger side. small plastic type screws remove panel
You are in big trouble if no one has expained to you where the battery is and a myriad of other features that are somewhat strange on a Mercedes SL500. Try the trunk under the floor mat.
There are NO JUMP ports on these cars. DO NOT jump these cars or give anyone a Jump start you will damage the electrical system
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