http://www.etrailer.com/tv-t-one-wiring-troubleshoot-faq.aspx
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Today we are going to cover kind of a different subject. Basically, we are going to talk about getting your wiring installed and what is happening afterward. Okay, for instance, you went to the trouble to get your wiring installed, you plug it into your trailer, and nothing happens. There could be a lot of different things going on with it. First off, you need to figure out for sure whether it is on the towing vehicle side - the car or truck - or if it is something on the trailer. We will show you how to test the different types of wiring systems we have shown here. And that way you can tell for sure if it is your wiring harness or if it is your trailer.
First off,we have a regular T-one connector that goes straight into the vehicle itself and makes its connections and then goes out to the trailer - a real simple setup. Really these are pretty much bulletproof. The only thing that could really happen is, if you do not have the ground in the right spot, then these possibly will not work right. Other than that, these are pretty bulletproof. And the next one we have over here, we have a T-one connector with a converter installed in the middle of the harness. Basically, this is about the weak spot on this type of wiring. There are five wires coming in and it converts down to a four-wire system and back out. A lot of times, in here this could break, for whatever reason. It could be from the factory. It could be when you plug it into your trailer you have a short in it and you do not know about it. It will cook these almost in an instant. It depends on how severe the short is.
Also we have another wire harness with the hard wire. Again, it basically just has the ends here that you hard wire into the vehicle. Pretty similar to your T-one. It has the same converter and everything. All the testing procedures apply to both of them. In fact, we will use this one to show you how to test everything on the wire harnesses. First off, we are going to show you the simplest T-one connector. Again, this is the kind that just plugs into your vehicle and you do not even have to worry about ground wire, having to screw it to sheet metal or frame. This one, what you want to do is to test it. Basically there are two ways you can do it. First off, with it plugged in, you want to test behind the connector right here. You want to test these wires with a simple wire tester. You can use something like this right here. This is a real fancy version but you can get a simple one off a website or at a local auto parts store. Basically it consists of an alligator clip and a probe right here. You simply just pierce the wires. When you do this, you want to ground this to the ground on the four-pole right here. And the reason why you want to test it here first, as aside from back here, is to make sure you have got power coming out of the connection here and going to the wires. Because if you have power here but you find out you do not have anything here, that lets you know that somewhere in the wire is a break. And you could actually work your way down piercing the wire to find out where the break is and then make a repair that way. Basically, though, at that point, it probably should be taken out and replaced. But if you are stuck on the road somewhere or in a hurry, you can patch it up that way.
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Tow Ready 7 Way Trailer Connector Tester - etrailer.comby etrailertv20,454 views
i agree with kwakman--or some silicone or there is brush on tape in a can now that is useable--anything to cover the hole.
archuka1 1 month ago
I would strongly suggest if anyone does test their wires with that type of probe that you put electrical tape over the areas you poked holes through the wiring sheath at. Even with the wires inside the vehicles I've seen oxidation happen on them just enough to cause problems. The holes are small but they are none the less open to the air so they can possibly oxidize.
kwakman99 9 months ago 2