I'm putting a 760 overhead light in my 740. I like the design of the 760 better then my 740. Although, I'm having problems wiring the thing up. Both of the overhead lights have the same color wires. Although the 740 has a brown ground wire and the 760 has an extra blue and black striped wire. I connect all of these wires up and the overhead light only works when the car doors are open. Got any ideas on how to fix this?