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Blower motor confusion

 
  #1  
Old 03-02-2019, 10:14 AM
1957 F100 New Guy
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Blower motor confusion

Hi Guys,

I have a ‘57 f100 with recirculating heat. My switch is a 3 position, 2 speed rotary, off, high, and low. I get full voltage in both high and low positions. The switch also has a cable through it, pushed in for heat and pulled out for defrost. I am missing the rod and diverter that the cable connects to. My two wire, blower motor works on the battery.
My questions are:
1. Where should the blower resistor be for low speed? I can’t find it.
2. When installed, the motor doesn’t work. The schematic indicates two grounds, where should they be?
3. Does anyone have a lead on where to get the rod and diverter to change between heat and defrost?

Thank you for your knowledge.
Matt
 
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Old 03-02-2019, 05:33 PM
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The dropping resistor is in the heater box itself. As an aside make sure the box is clear of leaves, pine cones or needles & old mouse nest and debris. A fire can result, the resistor wire gets red hot in operation. Jus' sayin'.
 
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Old 03-02-2019, 08:48 PM
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No blower motor resistor until 1960.

C0TF-18591-A .. Blower Motor Resistor-Use with Recirculating Heater / Obsolete

1960 F100/1100, 1961/69 C series Tilt Cabs.

Pic shows 18591 blower motor resistor at the top left.


 
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Old 03-03-2019, 12:27 AM
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NumberDummy,

Since ‘57 F100’s do not have a resistor, does that mean ‘57’s only have a single speed heater/defroster? Should I only have a two position, one speed switch with the pull cable? Any leads on the diverter rod and flap that the cable attaches to? Any leads on a pair of beauty rings for the headlights?

My wiring schematic shows two power leads, orange and red, from the switch to the motor. I am guessing that orange goes to one motor wire and red goes to the other motor wire. Then it also shows two grounds coming from the motor. How do I makes those two ground connections?

Thank you for your time,

Matt
 
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Old 03-05-2019, 12:08 PM
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The 2 speeds are accomplished by using different windings inside the motor. The orange and red wires are high and low power. I think the red is high but i don't remember for sure. there should also be a short black ground wire coming from the motor. The ground wire attaches to a sheet metal screw just outside of the blower housing.
 
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Old 03-06-2019, 12:47 AM
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Originally Posted by wyomingford View Post
The 2 speeds are accomplished by using different windings inside the motor. The orange and red wires are high and low power. I think the red is high but i don't remember for sure. there should also be a short black ground wire coming from the motor. The ground wire attaches to a sheet metal screw just outside of the blower housing.
It is is not different wingdings but an extra brush.

There are the 2 normal motor brushes set at 180° at the 6 o'clock and 12 o'clock position, a positive and a ground when they are powered you get high speed. there is also a third brush set at about 2 o'clock when the positive brush at 12 o'clock is de-powered and the 2 o clock one is powered the motors magnetic field is moved out of phase and it rotates slower.

See below pic of a brush plate from a 2 speed brushed motor with the 3 brush set up..

 
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Old 03-06-2019, 07:00 PM
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Ok. That makes sense. So I will run this motor knowing I only have Hi or Low speed, depending how I wire it. Thank you All for your responses and your knowledge.

Matt
 
 


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