I bought a hitch light which comes with a 4-way flat trailer connector. My limited understanding of trailer wiring (i.e. reading the manual) states we have a seven pin universal connector. I have found some adaptors (7 to 4 pin) but am not sure the proper terminology for our wiring. Is it a seven way split pin socket? Should I return the light or would an adaptor be practical? Any help would be greatly appreciated.