Use 12volt light tester with ground connected to something metal on the vehicle and check for power on the plug.Now lets say that everything worked except the running (clearance) lights. Now you're going to think I'm crazy but I want you to unplug the trailer! What, is this guy the actual dummy! How can I fix it with the trailer unplugged? The most common mistake people make is when they have trailer light problems they don't determine where the problem is. Ok now we should have an idea of which of these circuits is having the problem and we can start to solve the problem. Make sure truck has key turned on and try blinkers (Not Hazards).The first thing to do is plug in the trailer.You have a brand new truck and you know it's perfect, or is it? and probably the dealership that sold it to you. It turned into two days of searching for bad wires! I'm going to try and make this simple! Ok so you've already cussed at the trailer and the mfg.
We know this could ruin our whole trip and we remember the last time we had trouble with 12 volt wiring. The wife and kids are standing in the yard giving you that look, come on dad just fix it and lets go! So what do you do? Well we're men so the first thing is we walk around the trailer looking at the lights and we might even kick the tires as we walk by. I know they worked the last time I pulled it! No one else has used it. Ok so we're all hooked up and ready to leave but now the lights on the trailer won't work. It is meant to try and help you fix something that is actually not that difficult but we make it harder than it is. It is not meant to be used to teach college kids, although it would probably help them. This information is what I have learned over the years working in the trailer industry.
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