Hey, Folks. A while back, when we still had a Class C RV, I went on eBay and found an Add-a-Brake auxiliary brake thing for a really, really good price. I communicated with the seller and he assured me he had used it to tow from Maine to Florida and back two times. Then his wife got sick and he hung it up. When I received the brake, it was in the original box with all the cables and a couple of other things. No books or other paperwork. I know, I know, it does look like I fell for it. I'm looking for information

Prior to this "bargain" I had bought and installed a NSA Ready Brake system with which I have never been satisfied. Last trip, I just unhooked it and limped home. As a result, I do have the break away thing in place on my Wrangler. 

Now, I have tried to get this Add-a-Brake thing to work. It has the standard cigarette lighter power plug and another cable with two different connectors. I think one is for a brakes-in-use notifier. I put it in place and plugged it in today. I can hear a click when I press the Test button, but nothing else happens.

How does this thing work when I apply the motorhome brakes? Any help or advice available from you veterans?