Re: wire harness ?
No resistor about it, it's just a connection strip. I Don't know about a '73, but a '72 is:
Yellow 3 wires
Yellow/Gray + Gray 4 wires
Red 2 wires
Purple 2 wires
Purple/yellow 2 wires
Purple/white 2 wires
Purple/green 2 wires
Vacant.
I could have it backwards, end-for-end.