Isn't a 65 and an 85 going to use two totaly different, opposite regulator and wiring setups?
Does your 65 have only one large output wire attached with a ring terminal and one field wire that slips onto a flat spade terminal? I think the other field wire would be grounded at the alternator itself. This would use a regulator on the input side of the field wire to the alternator.
Does your 85 have one large output wire with a ring terminal and then two different field wires that slip onto flat spade terminals? This would use full battery system voltage in one field wire and then a regulator on the other field wire to control the alternator by adjusting the grounding to the wire.
The newer cannot run properly on the older system without grounding one of the field terminals.