Help! Trailer lights not working and need to move a boat...

[sab]

'05 ML 350. I installed my trailer hitch today, I used a draw tite hitch for the ML and purchased the factory wiring harness and factory 7 prong plug.

As per manual I installed and connected the main connector to the brake module and turn signal inicator plug. The lights do not come on on the trailer...

The manual shows on extra connector, which does not seem to go anywhere and the part I received from MB does have two extra connectors next to the brake and turn signal connector.

Am I missing a module? Is there maybe a fuse I need to install?

I am about to go and pickup my new boat and this is all keeping me from going. Any help would be great.

Thanks, Sab.