The lighting problems sounds like one we had on a Cascadia, but don't know what you're driving. Everything worked other than the running lights. It was a connector going into the fuse box located under the rear of the bunk. It sits along the driver side frame rail. Had the same problem with a couple of trucks. Usually pushing it in would fix it and ended up having to zip tie the connecter to the box when pushing it in only worked for a couple of hours.