Wire issue after bed removal

I have a the truck listed above it is a 1500. My buddy and I removed the bed to get the frame all washed up and undercoated/oiled. Also installed new tail pipes so did a bit of welding on those and some on the cab corners. And fixed up my mounted assisted back up LED lights. (Wired separately) Soon as I got the bed back on and plugged everything in, my truck has had issues with wiring/turn signals. Rapid blinking on either side, slow blinker on passenger side, fast on drivers, all lights blinking. Basically looks like a school bus all lit up. We have tried tracking down any pinched wires, tested fuses, unplugged the battery and plug back in after thirty minutes, tried replacing the circuit panel on the bed for the connectors but still have the same issues.