Hi all, is there a 12V source I can splice into (preferably under the front passenger seat) in my '01 W210 ? I need to power my headrest monitor. Thanks!

Rear fuse box & battery under the rear seat.

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Run new wires direct from battery, or will the fusebox have an unused source of 12V i can tap into? Also, I need to run the wires to the front right seat.