Lost trailer brakes and used volt meter to measure voltage out of back of 2002 f350 diesel plug in for lights and brakes and showed 12 volts to the trailer brake terminal when I activated the manual control on the brake controller. No brakes. Checked continuitity on trailer brake wire and ground and both good. I have in the past had lights and turn signals and still no trailer brakes because the plug was not making good enough contact for the brakes which require more to run than the lights. Still have the factory plug at the rear of my truck. Am thinking of replacing it. Any suggestions appreciated.....