All lights on my equipment trailer quit working. For awhile some worked and some didn't randomly but now nothing and it has a good ground. I know it's not on my truck side. My boat trailer lights all work and so do my other trailers. Found a worn spot on the brown wire fixed it and still nothing. It has a 7 pin connector. I hooked a test light to my truck, + pos. Side & when I touched it to ea. Prong on the 7 pin it lit up for all but 3 RH stop turn, LH stop turn, & the positive prong.
Is the 7-pin plug bad?