2000 Jeep Cherokee 4.0L AT. Engine compartment fire last year. Putting it back together. Rebuilding injector harness from scratch. Having trouble identifying some of the wires. Harness has 4 BR/YL wires. Schematic indicates they are all grounds: MAP, TPS, Intake Air Temp, Coolant Temp. MAP, IAT and Coolant Temp look to merge before going to PCM as single wire. TPS is separate single wire going to PCM. How do I tell which one goes to the TPS? Similar situation with injectors. I can match the driver wires just fine, but the supply wires has me baffled. They should be orange. I have three orange wires. I have a small section of the harness that survived the fire and in it are three orange wires merged into one. Looks like three #18 going into one #16. The schematic shows all 6 injectors with orange supply merged to one wire. which goes to the Power Dist Center to fuse #21 (20 Amp). The MAP and the TPS each have an orange supply wire. Can anyone help me sort this out?