Abstract: An electrical power strip for making power available from a vehicular DC power system to a vehicle accessory. The power strip includes at least one polarized receptacle and a conductor. The receptacle includes a slot and a positive contact aligned with the slot. The conductor includes a first end connected to the positive contact and a second end connectable to a positive terminal of the vehicular DC power system. The slot includes at least three extensions each oriented at substantially equal degrees apart from adjacent extensions. A polarized plug for use with a DC powered vehicle accessory. The polarized plug includes an insulating plug body and a prong mounted to the insulating plug body. The prong has at least three wings each oriented at substantially equal degrees apart from adjacent wings.