Look for a possible point of passage through the firewall on the passenger side just behind main computer box. You will see many other wires running through the firewall at this point. I had a cell phone, hands free kit mounted with the wiring running through this area.

Yes, 12 volt.

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Russell McMahon
Tulsa, OK
2001 CLK 320
1992 400se
1993 400e
2000 320ML