cigarette lighter question

My rule of thumb is

Fuse or breaker everything you can, as close to the battery as you can

If in doubt, use larger wire

All old Mopars are inadequately fused

All old Mopars use undersized wire (Headlights/ tail lights / signals are good example, as is the original battery feed and charging wire.)

Many argue that the wiring was "adequate for the day" but "back in the day" with the simple addition of some amateur radio gear, I managed to pretty well melt the bulkhead connector of my '70, and it only had a 60? amp alternator. I also ran 4537 landing lights back then, 100W apiece X2, so nearly 20A just for those on "dark and stormy nights"

And, I pulled a trailer with that car. I finally got mad one day, and had a great big roll of surplus no 14 silver plated, teflon insulated wire. I yanked the rear harness out, and rebuilt it with no14. HUGE difference. That car had 4 rear lamps, so those plus the clearance/ tail/ signal lamps on the trailer got "pretty dim" back there.