That blue wire is for the reverse light circuit, which is weird on Hopkins part because the electric trailer brake wire is commonly blue. If your truck had came with factory tow package like mine, you'd have 7 blade round female connector on the truck end. You could have bought a 5 flat to 7 round plug adapter for about $10 and had plug & play reverse lights. Just saying.
GLCG SAID HE JUST BUYS A NEW TRAILER, no biggie 🤣 But a guy like myself this video is very informative, that’s one of my pet peeves, trailer lights! Great video Moe 👊🏼
