i just tried to change my round 6 pole trailer plug out to a flat 7 rv style plug on my 93 f700 and it all went haywire. ive been back and forth between the 2 different plugs and cant make either work. right now theyre hanging loose not touching anything and when i turn on either blinker the blinker works up front but also blinks the cab clearence lights. when the plug is wireed up the back blinkers blink opposite of what they should, even when i switch the 2 wires around. none of the wires in the plug have continuity with ground. the wire colors are red, yellow, green, brown, and blue. there is a black wire but its stubbd off no power no ground. ive wired lots of trailer plugs and know what color should be what. help if you can please