How to test the trailer brakes without a TV?

Me Again wrote:
Jack up one wheel at a time, pull the emergence brake pin and try to turn the wheel. Don't leave the pin out for extended time periods. Chris

Exactly what I do. Jack up one wheel, pull the breakaway pin, turn the wheel until brake locks, put pin back in, lower wheel, repeat for other wheels.

Wheel should lock up after a slight turn.

Jack up one wheel at a time, pull the emergence brake pin and try to turn the wheel. Don't leave the pin out for extended time periods. Chris

Also, if there's been a =lot= of grease passed through the axle seal, you'll likely see it slung all over the inside of the wheel(s) and the back of the hub(s). No matter what you get, if you're buying used, plan on a wheel bearing repack at minimum or a full replacement. FWIW, it should run you < $400 for good bearings, seals and installation. Some shops will run specials for a lot less.

Lyle

Google up a wiring diagram for a 7 pin connector. Apply 12v to the proper pins.

Take the wheels off, remove the drums and look for grease on the brake linings.
Buying a used 5th wheel, a good thing to do is to do a complete bearing/inspection repack. That way you'll know exactly where you stand.