What do you mean "Arcs like Crazy"?
Do you mean there is a spark when you connect the negative terminal? or that the terminal arcs to ????
There are always some open circuits on the Boxster - Alarm Box, Radio (for station presets memory), etc.
This means that when you connect a battery, there wiull be an instant current draw and likely a spark or two. It's normal.
But, you should always connect the terminals as quickly as you can because you can cause issues if you keep engaging/disengaging power from the battery. Also, with the fuel tank essentially right underneath the battery, it's generally not a good idea to be generating a series of sparks. Also be sure to hookup your battery vent tube as well.
Cheers!
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