1987 Chevrolet Corvette Wiring ignition.

I bought this car with electrical problems. From fuse box to ignition to plug on fire wall there was a melt down someone tried to repair. There are 3 wires from fuse box tied together going to blue plug on steering column pink wire. The same wire goes to plug at fire wall not sure of color no coating on wire. There is so much damage to main harnice that 30 wires had to be repaired. The wire going to firewall plug was run through fire wall by making hole in firewall to bypass plug most have been repaired can't find good schematic fore this could really us help to be it is done correct. Thank you