1984 Ram Crank No Start

matthon said
It seems odd the harness has 4 wires, the plug 5 female connectors, and the ECU 5 pins.
Does that mean a 4 pin ECU will work as well?

It's not odd. Take a look a some other multi-terminal connectors - like the ones on the bulkhead. Unless the vehicle is fully optioned out, some positions have no wires on one side and some positions have no wires or terminals on both sides. Same part used for different purposes saves money, makes the older/newer parts interchangable, etc.

matthon said
I disconnected the 2 wire connector from the harness to the distributor, each end has a long pin on one side.
Key in run, I touched the long pin from the harness to ground and the coil wire would spark.

Why are you doing that?

Those two wires just carry a weak signal that is amplified. There's a couple threads here that go into depth of how it works. I've not followed them in detail. I'd be afaraid you'll burn out the circuit and I don't know what shorting it proves or disproves.
Basic operations of the ECU here: 1972 Imperial & Chrysler Ignition System Service Book (Session 292)
Basic ignition operation and concepts here: Ignition System Analysis (Session 259) from the Master Technician's Service Conference