I've owned my '83 W250 for several years now and have not paid attention to a white wire that had been purposely cut that exits from the blower motor (engine bay side) Anyone know the function of this wire and why someone might choose to eliminate this connection? Blower works at all speeds - recently I was into my fuse panel and noticed fuse slot controlling blower was burned -

 

Upon closer inspection, I see the white wire was part of a connector running to the blower motor - it was cut allowing just the green wire running to the blower motor but, someone connected another green wire to the white wire tag left at the blower motor and that line runs back into cabin - I wonder if this was someone's way of bypassing a bad resistor?

 

or someone shortening the distance and amount of connectors that the power has to travel though before getting to the fan. the power has to travel through about 12 ft of wire to get from the resister to the blower motor which is about 1ft away. i have considered doing this because the heater circuit is prone to issues with age and figure try to help it as much as possible.

 

Interesting, I need to see if the new green wire is hot but am assuming the original green wire which is still intact is also the hot? Weird? The new green wire going back into the cab could be anything assuming that whoever did this repair might have had only green wire at their disposal -will report back

 

From what I know if you bypass the resistor you will only 1 speed. Resistor changes voltage to the blower motor. I've also 1 wire blower motors and 2 wire.

 

I have all speeds - I wonder if someone changed the motor? - will have to trace that new green wire to see where it connects