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Just bought a 1980 toyota pickup and trying to get some of the wiring straightened out. I did download a FSM but I'm still having some trouble. The only problem area is by the battery. I think the two big green connectors connected to fusible link then the the positive battery. I'm not sure where the small green, black (or brown) with yellow, yellow with green wires attach.
We are the original owners of a 1980. It's not been modded at all. Unfortunately, it is not currently at my location. I'll take some pics the next time I'm down where it is. Sorry I can't be of more help right now. Good luck.
Some places to check Small Green wire may go to the parking or marker light on the right fender. Black/Yellow wire may go to the fuel cutoff switch on the carburetor . Yellow/Green wire may go the Temp Switch on the intake manifold.