Good, cheap, conducts electricity, angle connector

Usage:
Supplies the cooler in the trunk. For me, a cigarette lighter connector is in front of the rear row of seats, from there, the cable between the seats disappear and go into the trunk. Well, as it has proven itself. When other vehicles may previously check the required length.

Other recommendations:
Recommended here is a Velcro or other fastening of the cooler - but that's another story.