First check your plugs for corrosion. That is the most common place for problems by far. Helped a lady at a rest area in Il. a while back had the same problem. A bit of WD 40 and she was good to go. After that check your wires to make sure they are good. Just apply power and use a test light to see if you have power at all the wheels. Make sure you attach the ground for the test light to the ground for the brakes so you test the ground and hot wires for each wheel. If all that is good, the next step is to jack up the trailer so you can spin the wheels. Then Apply power to the brakes to see which wheels work and which don't. You can use your truck if you like or a battery charger works good too, but they have to be the old style with the needle gauge, the new ones with the digital readout won't work. You can also use a 12v battery with leads, but don't let it be hooked up too long because it can heat up the wires if they used small wires as most commercial trailers do. Just spin a wheel and have your helper apply the brakes, if they don't hit and stop hard you have a problem in that wheel. If you do it in this order you will eliminate each problem as you go so you're not chasing phantoms because something up the line is only working part way or not at all. As for the break away battery some charge from the truck and some don't. There is no way to know which you have without seeing your system. Most of the older trailers did not charge that battery, most were disposable dry cells. You will be able to tell by looking for the charging wire from the harness to the battery.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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