Before you get to technical, it would be good to include what year.
In general, for the coil, you will have two wires to the coil. One is a resistance wire, the other is from the "R" terminal on the starter solenoid.
The resistance wire goes to the fuse panel. If you no longer have the special resistance wire you can use a ballast resistor. Advise.
Check your local tire shops for availability of 16.5. It may be a local or regional availability.
