Mystery wire?

partsman01 · 07-28-2005, 08:16 PM

Well, never fails when I start a job, figured late tonight I would start doing the wiring of the plug for my truck, take the end apart from fifth wheel to see what colours there are, and there on the center one is a yellow wire, I think about a 14 guage, anyway it appears to terminate at the inverter, and it like three others are marked "lights" well what the heck does that mean, it has a 20Amp ATO fuse.
So does power come down it?

partsman01 · 07-28-2005, 08:16 PM

Well, never fails when I start a job, figured late tonight I would start doing the wiring of the plug for my truck, take the end apart from fifth wheel to see what colours there are, and there on the center one is a yellow wire, I think about a 14 guage, anyway it appears to terminate at the inverter, and it like three others are marked "lights" well what the heck does that mean, it has a 20Amp ATO fuse.
So does power come down it?

**Hitchhiker** · 07-29-2005, 01:54 AM

It might be for backup lights, if so it goes on terminal #7 in the center of the connector. Click here for a wiring diagram and connection chart.

partsman01 · 07-29-2005, 05:59 AM

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Hitchhiker:
It might be for backup lights, if so it goes on terminal #7 in the center of the connector. Click here for a wiring diagram and connection chart.

</div></BLOCKQUOTE>

Thanks for the reply, I figure the black and white heavy wires are the power circuit and that they charge the battery amongst supplying power for running the lights and signals while driving, but the yellow wire seems to go to the inverter if I am correct and it is marked with another three spots that say lights, but I see no evidence of any back up lights, so seems odd they would put it there and not hook it up, I was wondering if they made it the battery charging system, but that does not make sense either.
But I will have to see if I did indeed track down the correct route of the wire, and put power to it and see what happens, just wish I had met who ever sold this rig to see how their truck was wired.
Kinda puts me in the dark, I had no way of towing it at the time so had it delivered.
So until I wire my truck which I am afraid to do in case this wire causes a problem.
I guess I will see what I can figure out.

RustyJC · 07-29-2005, 06:23 AM

I would highly recommend that you wire your truck and trailer to the 7-pin RV standard Richard has provided. This is how current pickups and RVs are wired. Adhering to this standard will save you lots of heartache if someone else ever needs to pull your trailer (i.e., truck breakdown) or if you ever need to pull someone else's.

Rusty

partsman01 · 07-29-2005, 07:09 AM

Oh, most definitely I am going to follow the code exactly, don't get me wrong, I understand it has to mate with anybody elses rig too.

But when I came across this yellow wire that appears to have no purpose, and yet seems to be attached to the inverter with a fuse, made me leary of plugging into it when I am done, as I have no idea what they meant it for.

I now know, thanks to help from people here that my info showed orange there, but now I see they did indeed use yellow wire there too, for back up lights I gather.

It must serve a purpose, but I see no lights for it too run.

It is no good once the truck is unplugged and so it is only for when running hooked to tow vehicle obviously.

But I guess I will power it and see what happens.