Note that there is no connector near the ground wire, which is forward of the L taillight. C418 is located inboard of the L frame rail between the rear bumper & the gas tank rear crossmember. Earlier Broncos ('78~91) have a bulky 3-pin connector for the window motor near G400 (the ground is only used with the optional defroster). They also have a single-pin connector for power to the optional defroster. Very early FSBs ('78~86) don't have this style of C418 or any connector in its location - the t/g frame harness is continuous from the firewall up to the taillight.
