We have demonstrated all of these fixes checking the ground on the trailer. The trailer itself is actually used as a ground obviously. Now there is some cases where you boat trailer guys and some small utility trailers out there, the ground is actually carried in a separate wire that lowers the trailer frame completely. The same tricks apply to check and make sure your light is working. Again the connection to the light could be bad or it could be actually a smashed wire underneath the frame of the trailer or also up front where you have got a little bit of road rash dragging the ground. We will go ahead and show you next an example of that type of wiring on a different trailer. 01:04
All right this example here will show you that first off one way to check it to make sure is look at the 4-pole at the end of the trailer at the tongue, follow it down. If it does not stop anywhere where you have an opening or any parts to the frame or anything like that then chances are the ground is wearing inside the wiring harness. And on this example here we can start by looking at the tail light and we have got the wire harness. 01:27
On our other trailer it had two wires going to it, the right turn and the running light circuit. On this one we actually have three wires. The third wire would normally be going to the frame on the other trailer however on this one the third wire is our ground. So that tells us that our ground is carried in the wire itself. So it ignores the frame completely. So if you have something like this and you have some weird stuff going on check to make sure your ground wire that is going to the light is good. Obviously this is a sealed connection but some of them can be bolted onto the stud on the light itself to give you an example like that. Or this wire could somehow have gotten mashed somewhere up in the frame too. This is something for you tilt trailer guys out there. The big problem about that is on the tilt trailers is that you have a pivot point right here. You have got the tongue or the ground wires attached to and that ground has got to go through the tongue, through this pivot point, and out to the frame. In this case it is going straight to the axle which is not going to do us any good. If this was going to the frame the ground is going to get corroded up and rust and all of that stuff. Even though it kind of moves every now and then and scrapes it it still is not going to make a good connection. And there is a real simple fix for that. All you have got to do is run the wire from this point to the other side of the pivot point. Just enough for it to work and it carries the ground on both sides and then you do not have to worry about the lights flickering or anything like that.
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