I hate wiring

[chevymanjt]

Hey guys, working on the 68 trying to get it back on the road and I’ve ran into a problem. I have headlights and hazards, but no tail, brake, or reverse lights. I unplugged the rear harness from inside the cab and ran a jumper to the rear harness and they worked. I also checked for 12v on the orange wire on the backside of the fuse box and there is none. I’m an idiot when it comes to electrical so I have no idea what this means, any help is greatly appreciated!