Harness compatibility help

Mattax said
1973 Harness on the car.
The alternator output wire, and the field wires, all go to an engine bay connector. That was done for several years. Reportedly to easy manufacturing. Connections there can be problematic. Especially if , as may be in this case, the wires are hanging free with no support. Worst if over the exhaust.

From the '73 service manual. CE = Connector Engine Comparment

R6 12 BK = Alternator wire 6, 12 gage, Black (output wire) note this is always hot since it is joined to battery positive.
R3 18 DGN = Alternator wire 3, 18 gage, dark green (field control)
J2_ 18 DBL = Ignition Run, 18 gage, dark blue. (C, F and G are wire segments or branches)

Mattax said
1974 harness.
Alternator output wire goes to a seperate connector.
When you note differences like that, that's when it time to refer to the diagrams in the shop manuals.

From the '74 FSM.

So yes the connections are different. Since you have both halves of the connector, maybe it doesn't matter.