I will tell you what I have done, and what happens and then tell me what you think could be wrong.  The brakes on my trailer are not working, but everything else is.

I have a plug in the box of my truck that I use, small one (which is what the trailer came with)

I just put the adapter on it and plugged it into the stock plug, and it LOCKS up the brakes on the trailer, as it is wired different then my trailer.  But the brakes do work.

I just can't get them to work in the little plug in my truck?  So what could be wrong?  Maybe the connection from the little plug into the main part?  But everything else works fine, other then the brakes from that plug?

HELP!  Oh, it is a Cherokee, and a Ford truck.

I guess I worded something wrong.  The only reason I put an adaptor on it to see if the manufactur plug worked, was to see if it was the trailer that wasn't working or the truck.

It is something wrong with the little plug.  I have no intentions to use the bigger plug, nor do I want to.  Everything in the little plug works but the brakes.

Oh my, I guess I SUCK at explaining things?

I have TWO plugs on my truck.  The factory one (BIG) and the one we installed seven years ago, to fit the trailer (small).

Everything WORKED fine with the small plug for the last seven years.  Now the brakes are not working, just the brakes, everything else is working fine.

So today, I put the adapter on it, and plugged it into the big factory plug on the truck, to see what happened.  As should, the trailer brakes locked up, as it has two wires crossed.  So the brakes on the trailer are working.

So it is something in the small plug that is not working.  That is what I want fixed.  I don't need a new plug, I don't want to plug it into the factory one on the truck, cord is not long enough and will pull out, hence why we put the small one in the bed to MATCH the trailer.

Thank you, I will go check out the pins in the plug in the truck.  Will it wiggle if it is loose?

Tried to get the plug off the trailer today to see if any wires were loose, but no such luck, it is ON there!

Thanks again and sorry I can't put it into words what I am trying to say!

Get you one of these. It'll be ya best friend with these type problems.

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=4288

And a copy of this....  http://www.horsetrailerworld.com/home/wiring.asp

FIXED!  A guy from BHW told me to call him!  It was so simple!

I had to take a screw driver and put it in the slot of the prong on the plug in the truck and spread it out a little and WA LA BRAKES!!!!  YEAH!

I remember when I had to mess with trailer connectors..................I dont do that anymore;

http://www.ezconnector.com/best-trailer-plug.html