I know this trailer control module regulates trailer lights but what about electric trailer brakes. Volvo Part # 30756529 & 30 (Volvo 7-way/pin trailer wiring harnesses) require the Trailer Control Module Part #30664974. I have the OEM 4-pole wiring harness Part #30664651 already and the trailer control module. If I swap out the 4-pole connector with one or the other 7-way/pin is that all I have to do to get electric brakes (on a very small pull behind camper) to work?