Recommended 7-Way Round Trailer Connector And Wiring If you are looking for a round connector with a 7-way blade I recommend part # H20046 is a trailer end connector with 8 ft molded wire. For a 7-way with 6 ft of molded wire you need part # H20044, and for the connector with 4 ft of molded wiring you need part # H20043. for a connector with a coiled wire I recommend the WesBarg 7-Way, RV-Style Connector, part # WG54006-043.4.9/5(139) Trailer 7-Pin Wiring Harness - USA version? Jun 24, 2010My new trailer has a 7-pin plug. My 4-pin kit from IPDUSA doesn't charge the batteries. but an adapter I put on does work flawlessly. Still, if it's a 7 pin, I was thinking maybe a Volvo OEM 7-pin harness would be ideal. There is talk on Swedespeed that the 7 pin harness kit from Volvo is actually the Euro 7-pin version. Is there a 7-round-pin version for North America XC70's?
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