Have a '16 2500 HD Crew Cab with 6.0gas. Front passenger door alert sometimes shows up on dash when door is actually closed. Also, no window up or down from the door switch or on the driver's door. I tried changing out the door latching mechanism / box. Did not fix. I was told check the wiring harness. I took the entire door apart and got access to the harness. Unplugged it from the frame and worked it through the door so I could get a good look. Did not find any broken wires. Did find one that had the plastic chaffed off, so I cut it and spliced it back together with no luck. Before I buy a new harness is there anything else I should be looking at? Fuses all good and no other indicators. Thanks.