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the secret here is to buy a trailer harness for the vehicle ( available from most tow bar supply and fitting shops )
it is a set that just plugs into the existing harness at the rear light assembly ( piggy back arrangement)
from there you wire the male and female plugs as per the color code that is on the paper that comes with the units
saves cutting into the car harness and causing real electrical problems
the simplest way to do this is to go to a tow bar installer shop and buy the harness ( around $25.00 aud)
it is a simple action of pulling a harness plug apart and inserting a piggy back plug in the connection
the wires for the trailer are properly installed and all you have to do is wire the plug connection according to the wiring diagram that came with the plug
The easiest way is to go to any RV dealer, or most Autoparts stores and buy an adapter. They plug in to your existing wiring harness under rear of vehicle and then you simply plug your connector in to it from there. Saves trying to figure it all out and cutting or splicing into your existing wiring and possibly causing problems later.
You need a "test light". Then you turn on the circuit you want to wire in, tail lights, brake lights, blinkers and poke around the back of your light sockets until the test light comes on. Then you splicew into that wire and run it to your plug in. If you don't know which wire is what on the trailer, hook it up and with the wire fastened into the truck harness, try it on the trailer harness wires until you get the proper lights working. Process of elimination. Hope this helps.
Your local auto parts store should have a wiring harness that will clip in to your existing harness. Modern vehicles mostly have a harness coupler under the back of the vehicle you can unplug and plug in the trailer harness without having to cut anything, making the installation very quick and painless. The harness plug may have a plastic lock which you will need to release to separate the two sides of the harness. I recommend putting dielectric grease in both sides of the trailer harness to prevent corrosion from knocking out your trailer lights. The trailer harness kit will have instructions and a diagram to guide you. Hope this helps and please rate my solution!!
Take a 12 volt test light... the kind that has a spring loaded clip to hold the probe into the wire, and insert it into the wire just before the trailer plug, vehicle side. (Blue I think) If there is a connection, the brake should see it and you should have an indicator light. When you activate the brake the test light should lite up. If not, move up to the brake actuator and test the blue wire. If there is nothing at the actuator, check the black wire. It is power to the controller. If no power there, check fuses again. If it does pick it up at the plug, connect the trailer and test the trailer itself. First ground to the trailer and then to the truck. Most problems are ground wire related. Then move to the axle and test it there. For the brakes to work, and even show on the indicator, there has to be a ground and power to the brakes themselves. There are 2 wires to each brake... a ground and a power. Test across both wires to make sure you have power and ground. You can also hook another trailer to your truck or another truck to your trailer. Lights can work through trailer ball ground. Brakes can't. leave the trailer unhooked from the trailer and hook the wiring up and test the lights. That usually will indicate a good or faulty ground. Also make sure there is a GOOD ground to the truck frame/body. Also try http://www.etrailer.com/faq-wiring.aspx. They have a great website with lots of info. Hope this helps. Mike
If the lights are working on your vehicle, then no. With a test light, check to see if you're getting power on the plug coming from the vehicle. You should if all the lights are working on your truck. I'd check the ground wire to the plug on the trailer harness... probably loose or disconnected, especially if everything quit all of a sudden.