I needed a 12 VDC power tap for my RC aircraft recharger. The "cigarette lighter" would not handle the power requirements reliably.
Why? The lighter port can handle 20A, maybe more. You have a 18A charger.The "cigarette lighter" would not handle the power requirements reliably.
You missed the part where DVB saidThere must be something wrong with my passenger lighter port. It did not want to work.
I wanted something in the trunk area as I always back-in to my flying spot.
A 20 amp in-line fuse is a GREAT idea, thanks.
And there're terminals under the hood with 12V from the battery to use for "jump-starting". You could use them.