Hi all, I have a two wire three speed heater blower motor that won't work properly. I have read some trouble shooting procedures from some previous threads with no luck. It runs independently connected to the battery. It also runs at high speed with the yellow wire grounded. I grounded the switch independently and it ran with the switch in the off position only, but with a voltage drop. 8 to 5 volts. I have a new switch and new resistor. Wondering what the next logical step might be moving forward. Thanks in advance for any help.