Electric brakeissue

Thank you for your response! i ordered complete kits for 2 axels from amazon. The drums that i received turned out to be the wrong bolt pattern so i used the existing drums as they measured the same as  the new ones. replaced the backing plates that had all new components(magnets and brake pads). made sure that the small pad was facing front. we adjusted them so there was just a little drag but turned freely. when i started towing i tried the manual function on the controller and it didn't slow down at all. Making me believe that they were not tight enough. I just used my truck brakes to stop thinking i would adjust when i got back. however when i went to leave the campground 1  wheel was locked. i freed it us enough  to get home but could smell brakes when i got home.

Wiring was done just as it was and i did not get any errors from the controller. i have ordered a new plug for the 7 pin and will be replacing that today in case the signal was not getting to the brakes due to oxidization of the plug.