Be careful with the orientation of that "resistor" (attached image on the right) - if it is the correct Runtz-style reducer there is an input side and an output side.

The one sold by Classic Parts (in my post above) is made so that it cannot be mistakenly installed backwards (and it includes screw ends/fittings). (attached image on the left)

https://fifthaveinternetgarage.blogspot.com/2015/11/the-runtz-story_10.html
Attachments
runtz style 12v ti 6v reducer.jpg (20.12 KB, 214 downloads)
parts 123 resistor not runtz reducer.jpg (63.45 KB, 211 downloads)