Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 7-Pole And that'll finish up our look at and our installation of the Curt Fifth Wheel and Gooseneck In Bed Trailer Wiring on our 2014 Ford F-250. Customer Reviews Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 7-Pole Connector - 7' Long - C56070 I have attached a diagram showing the dimensions. 20,000 lbs item # C16536 in a 2001 Ford F-350 DADRL - How To Disable DRLs FORD F250-550 trucks. On 2005 to 2007 F250-550 trucks, the DRL's can be disabled by placing the common side of the switch of a 12 Volt Isolation Relay to circuit 162 (Light Green with Red stripe) at the Battery Junction Box (BJB) side of the circuit, connecting the Normally Closed Relay pin to circuit 162 away from the BJB and the Normally Open