What you called a resistor is actually a factory diode on the AC compressor line.
The diode prevents the AC clutch from creating a voltage spike or arc on the relay contacts when engaged. I know it looks like a hack job but that's how the factory did them at the time. Newer cars have the diode placed in the fuse panel which is a much better, safer and more elegant spot in the harness.
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I build my own junk...
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