Wiring help on firewall

[Orion 762]

I've got a '71 Cheyenne, 350 automatic, bought "used" a month ago. After getting the HEI wiring sorted out, and a new wire run from the eng. harn. conn. to the distributor, I thought I'd go poking around to see where "all those other un-plugged wires went. (I downloaded the 67-72 schematics, and 90% of the wires/colors match the original, but it's that last 10% that I'm curious about).

On the driver side firewall, engine side (looking from the front of the truck with hood open, this would be the upper RH side of the firewall, just behind the driver-side hood hinge) there is a "set" of relays mounted to the firewall (with bolts) and a good handfull of (about 6) wires (black, green, light green, blue, brown-white, green-white) coming "from" the relays to a harness that seems to "go no-where". Two of the wires go to what used to be the "backing lamp switch connector" on the old manual tranny, so I've got them figured out (not needed anymore). Two of the other wires (green and green-white) had a "spade connector" simililar to the one on the temp. sensor on the block. Another one "used" to go the an oil sensor gauge on the block, but was disconnected. Not sure what the other wires do, but most thing seem to work okay without any of them.

Question: any idea what the "relays on the firwall" were for?? I can't find them on the 67-72 schematic.

Any hints/help is appreciated . . . Thanks.

Orion 762