I just i stalled the new engine and used an engine wiring harness that I got from a ‘76 malibu. My car is a ‘76 el camino with a 406 sbc. The harness is in great shape. I have power up to the fuse panel on the engine side of the firewall but nothing on the fuse panel inside. No lights. No ignition. Nothing. My son in law who built the engine is a great mechanic and seems to know his stuff but I’m not convinced about his electrical knowledge. He thinks that the engine harness isn’t compatible with the original one and that’s why there’s no power. I am of the understanding that it’s the exact same harness. Can anyone shed some light on this situation for me. I want to get this thing back on the streets bad!!!