Sounds like a ground issue to me,too. Did you purchase any wiring/light kits from Harbor Freight? I had the same thing happen to me today! I had a set of cargo lights already installed on my headache rack,and I bought 2 more (Farm store,but still Chinese) to tie in,as back-up lights,on the same switch,(for now).after I installed the "new" lights,they worked,but the headache mounted ones did not! after raising the bed,(easy access),I noticed that I had no continuity,where the H.F.(Chinese) wire was connected to a heavier gauge wire. It pulled out of the butt connector,which was also a heat-shrink connector! upon further inspection,it may have had 10 strands of copper,(at best),and you can easily pull the wire apart with your bare hands-insulation and all! I doubled-up on a heavier-gauge wire,crimped the butt-connector good and well,srunk tubed it,(even though the butt connector was heat shrink as well),and zip-tied it to some others,(A.A.W.)to relieve any stress. I pulled the switch,and Voila!! We have lights!! Hope this helps!
Last edited by wetwilly5757; 07/26/2014 5:38 AM.