I got a Tekonsha Prodigy brake controller from etrailer.com. Any auto parts store or RV shop will sell brake controllers too. The real work is you have to wire it up to your truck, you will have to run extra wires and install a new 6-pin or 7-pin round plug to replace the 4-flat, depending on what your trailer has.

 

I have seem an adapter for my 4 pin flat harness what will turn it from that to a 7 pin round. Will that work?

 

I have seem an adapter for my 4 pin flat harness what will turn it from that to a 7 pin round. Will that work?

That will only get you turn/stop and tail/marker lights. You need more wires to do brakes.

 

Check this out... it may help you understand what is needed.

 

Even if you get the 4-pin to 7-pin adapter you need to run more wires. The 4-flat only gives you brakes, turn signals, and running lights. Depending on what functions your trailer needs, you can get away with running just one extra wire, the blue one to activate the brakes. The remaining 2 wires would be for +12 volts and reverse, which you might not need, depends on your trailer.