 1991 Mustang GT, One piece headlight issue-help!
I have a 1991 5.0L GT I bought the one piece black headlights from mr. body kit and I hook up the harness and the other wires and I've got a fog light that won't go on and one head light that is dim the signals don't work right no matter how I wire it!!!! I was given a harness to change from 9004 bulbs to 9007, when I check voltage there is 12 volts on two wires and zero on one which is the ground, but on the other side there is 12 volts on one wire and nothing on the other two. One of the side marker lights has 12 volts and will not come on and I tested the bulb and it's good, I am losing my mind!!!!!!!!!!!!!!!!!!!! | 
