Okay, thanks. But there still might be enough info to make some kind of conclusion.
When in low-speed mode, the ground is made direct through the switch, and no meaningful current would go through the resistor even though it's there. When in high-speed mode with smoking resistor, the ground switch is opened, so the current from 'Shunt F' goes through that resistor (which it is supposed to).
My middle power pin has 12.1v (wiper motor going)
Voltage at low-speed pin (wiper motor going), low-speed switch open - not grounded is 9.4v.
So, the voltage drop across the 20.3 ohm resistor is 9.4v, which would be 0.46 amps. or 4.3 watts.
Maybe there is just too much current finding it's way through 'Shunt F'.
I guess if you (or anyone) get a chance, could run dual speed wipers on high, and measure voltage at the upper pin (low-speed grounding pin), and voltage on the middle pin (should be 12.x volts, but good for reference).
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