All cars with remote battery location has a battery + jack inside the
hood... have a label on it... and a cover...
Negative is any bare metal points in the hood... however MB did provide a
brass thing sticking out like a sore thumb for that.
If you can open the hood you might find a red capped + terminal to which
the + jumper can be connected.
Any substantial metal part of the engine - away from the belts and fan -
can be used as the - (ground) connection.
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