Help-Trailer wiring

[pblaze725]

The lights on the trailer aren't working but the brakes work.
They worked fine the last time I used it.

I'm hooking up a Big Tex trailer to my Tundra. I'm using the 7 prong round connector.

 

[oakknight]

http://www.etrailer.com/faq-wiring.aspx
start checking pin for pin. starting with a good ground. Most common problems with trailer wiring is a bad ground.

 

[pblaze725]

Thanks. I'm pretty sure it's the ground.