My 1992 Coleman has 3 rear lenses, a "backup" lens (red with clear insert in the middle), tail light lens (solid red), corner light lens (solid red), with a 4 pin connector. Did backup light/reverse light ever actually work for its intended purpose, or did maybe a past owner rewire using a 4 pin connector? If the 4 pin connector was standard, what was the purpose of a back up lens since it needs a 5th wire to work? Is it worth rewiring to a 5 pin connector so the light/lens will work? Thanks for your feed back!