7 Pin Connector Cover. I've not had any problems with my Pollacks in. Seven-pin connectors are rarely used on trailers for local use.
Repeat this process for both turn signals. The seven pin connector has pin assignments as follows. I drew this crude diagram to help explain.
Note the location of the pin.
The three additional pins are: trailer brakes, back-up lights and trailer battery charging.
The missing pin is a ground that's tied together with the other ground pins. I drew this crude diagram to help explain. I've not had any problems with my Pollacks in.