i have a 2006 ridgeline with a factory towing package. Up until I have had no issues. Now I have no trailer lights. The fuses are all good. I have verified that the lights on the trailer are wired correctly and in working order. I have tested the 4 pin and round harness. They have ground and powers where they are supposed. Everything seems to be correct. However , I have nothing. Any ideas!!???!!???

 

Could one of the relays have failed? You could pull them out and test them.

 

Is your vehicle turned on when you are checking the lights?

If you're getting power to the pins, the only other thing I can think of would be a bad ground on the trailer wiring.