This is a good chance to strip the engine wiring down to the essentials:
1. The green wire to the coolant temp sender
2. The tan wire to the oil pressure sender
3. The pink/white power feed to the oil pressure switch
4. The dark blue out of the oil pressure switch to the choke warning light
5. The light blue from the oil pressure switch over to the choke heater
4. The two small wires (red & brown) to the alternator (excitation & voltage indication)
5. The big red to the alternator (battery charging and system supply)
6. The pink to the BATT terminal on the distributor (coil primary feed)
7. The flat braided ground strap (cab firewall to RH cylinder head)
8. The main ground cable from the battery negative to the alternator bracket
9.The white wire to the TACH terminal of the distributor (if you have a tachometer)
Other essential engine related wiring in the engine compartment:
1. Main (black) cable from battery positive to the solenoid B terminal
2. The two red branch lines that also go to the B terminal
3. The purple lead from the ignition switch to the solenoid S terminal
Here is a nice clear dwg of the 1984 C/K engine compartment wiring:
You must be registered for see images attach