Long story short, about a week ago I noticed a tiny dent in my hood popping up from the inside. I pop the hood, look inside and am surprised to find a giant hole in the plastic shield on top of the fan! No serious damage noted to the fan blades or anything else, guess I got lucky. I'm assuming it was a rock I may have picked up when I went through a deep puddle on a muddy road. Anyway, coincidentally a few days later I offered to help a friend pick up his boat from a marina. Turns out my trailer lights, which all worked beautifully in the past suddenly don't work at all. Not one. I know it's my truck and not the trailer. I've checked all fuses (one was blown, but when I replaced it, no change) and now I'm needing to trouble shoot the problem further. If no lights work at all, to me that means the whole harness is shot. I'm wondering if it has something to do with the dent in my hood? Maybe that deep puddle shorted out something? Or maybe the rock also cut through the entire harness somewhere? The latter is highly unlikely, I realize, but you never know. Any tips for the best way to go about trouble-shooting this problem? My overall mechanical knowledge would be intermediate-advanced but when it comes to electrical it's more towards the basic level.