Installing a 7-Blade RV Connector on a Ford Expedition When I purchased my 2012 Ford Expedition, it came with a hitch, and a 4-pin trailer connector. There wasn't a brake controller installed, and I needed a 7-blade connector so I could pull my trailer. Adding the 7-blade connector and brake controller was not complicated. Amazon: ford 7 pin trailer connector wwwon›Search›ford 7 pin trailer connectorAmazon: ford 7 pin trailer connector. Skip to main content. From The Community. Try Prime All NEW SUN Heavy Duty 7-Way Trailer Light Circuit Connector Tester w/LED 7 PIN Round RV Blade Electric Wiring Adapter. 3.3 out of 5 stars 3. $9 $ 9. 99. Get it as soon as Tomorrow, Mar 22.