The # 118158 is a converter to use when towing a trailer that uses a 3-wire system. Since it sounds like your trailer has separate brake and turn signal circuits will you will need to install the converter on your trailer.
The converter installs on the trailer right after the 4-way connector. Both turn signal/brake light circuits will go into the converter. The left hand side to the yellow wire and the right hand side to the green wire. Then on the out put the green will go to your... view full answer...
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