What I have is 1993 k2500 8600gvw 5.7k 4l80e 241tc,what's left of original wiring zip tied to trans lines, think I have 3 wire plug for shifter and 4 wire connector for front axle, transfer case switch is 3 wire also don't see relay at firewall, previous owner had run 2 wires to toggle switches under steering column, would like to restore to original, any help appreciated