Blower Motor Inop on High Speed

[TurboWh1]

So was it corrosion, wiring, or the relay?

I actually had two problems... the resistor wiring was somewhat melted and in need of repair. So I soldered a new plug on at the resistor. As for the high position of the blower fan not working, there was corrosion on the big red wire at the plug by the power antenna. Cleaned it all up, works like new again.