I've got a 1981 Datsun 280ZX automatic n/a. When I bought it, the blower motor didn't work, so I started chasing wires. I pulled the trim off the passenger side and noticed that the plug into the relay on the bottom of the blower motor was unplugged and that two terminals were jumpered. The blue/red and the red. Upon further inspection, the red wire had another wire tied into it about 3 inches away from the terminal that should have been plugged into the relay.
So I followed that aftermarket wire to a toggle switch under the steering column and found that with the ignition on or off, it never had voltage. So I traced that wire that was supposedly feeding power to this aftermarket switch and it was tied into the green/yellow wire apparently coming out of the ignition switch in the column. It's likely that the load of the blower motor burned this out. The wiring schematic shows it going to a blue wire in the instrument panel. Does this mean I need to replace my ignition switch? Because it appears that it was used to send power to the blower motor switch.
I also found that when I feed that jumpered terminal that goes to the blower motor some power, the blower fires right up and works. Does this mean that the relay or something upstream of the relay is bad?
Part of what sucks about working on old cars is that you have to undo people's "fixes" to determine what the real problem is.
Chris
