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Message: <blockquote data-quote="MrGiggles" data-source="post: 497754" data-attributes="member: 22613">I would suspect a bad ground on the vehicle side. Perhaps the only connection you're getting is through the ball, may work fine on the old one but not the new one with fresh paint in the hitch.I'd say the thing to do would be to load test each function with something like a headlight bulb that draws a few amps, and hook to the ground pin in the receptacle, not the chassis. If it is not lighting up the bulb, then move the ground clip to the chassis, if it lights up you have found your problem.If you had a power probe, I would suggest just applying power to the ground pin and short circuiting it, if it pops the breaker in the probe then you know it's capable of carrying 10 amps, more than enough for trailer lights.I have stopped using the flat plugs and converted everything to the round 7 pin RV connector, they're more secure and durable, with no exposed pins to corrode.</blockquote>