Headlight problems

[Adan]

So when I bought my truck I never realized that the low beams on the truck weren't working right, Only one side worked so I just replaced the bulbs but nothing, So I decided to go to the headlights and moved around some cables that run from the fusebox to the headlights and that seemed to turn the high beams on and I'd used that to drive at night, Everytime I had to use the headlights I had to mess around with the wiring until it eventually turned on but now they dont turn on no matter what I do, I traced the wiring and it seems to be a wiring harness that plugs into the fuze box, I imagine a cable had been bent for a long time and stretch and it broke from inside cutting the power and only working when moved around so that the insides touched again. So anyone know a solution? maybe I changed out the wiring harness?