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  #1  
Old 05-03-2012, 08:06 PM
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Default 2 wire blower motor

I have A/C on my 59 tbird and the blower motor has 2 wires(black ground and red hot wires) all the diagrams show 3 wire heater motors like the none A/C car on my other bird.I only have one speed on it (high)at the switch,is there not high and low speeds on the 2 wire motors with A/C ?Maybe I don't have the wiring right.
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  #2  
Old 05-03-2012, 08:21 PM
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You kind of answered your own question. For two speeds you need two hot wires (red and orange). You will only get one speed with a two wire motor.

John
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Old 05-03-2012, 09:20 PM
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After doing some research it appears that there is a resistor on the red wire that allows it to change to low speed. I haven't seen one so I can't say exactly where it is. Yours may have gone bad if it only has high speed.
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Old 05-03-2012, 10:09 PM
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Default 2 wire blower

I think cars with A/C have the 2 wire motor witch is bigger,I do have a smaller 3 wire motor I got sometime back with the same squirrel cage box for A/C cars,the cars without A/C have a different box and smaller motor.I don't see any resistor unless it is on the back of the heater A/C control .I do have a wires form what looks like a little coil in the bottom of the squirrel cage box that I thought was for just the A/C ,I don't have one hooked up(one orange and one red).

Last edited by tp tbird : 05-03-2012 at 10:23 PM.
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Old 05-03-2012, 10:24 PM
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I've got a two-wire motor with a non-A/C blower housing.

I hooked it to the high-speed circuit, and for as much as I run the heater/defrost (hardly ever), that's fine for me.

There's a maintenance guy at work (we call him the "rabid spider-monkey" cuz he's a small guy, but full of **** 'n vinegar, and he can fix or build ANYTHING) who says he could make it into a two-speed motor with some cheap resistors. I'm sure he's right... I'm just not that motivated at this point.
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Old 05-03-2012, 10:47 PM
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When T-bird started in '55, Ford used three-wire heater motors, and carried them over for years. For the '60 model, someone finally woke up and realized the motors don't need two separate field windings, they could be made cheaper, and they produce as many speeds as you want using resistors and switch settings. The more resistance the switch 'cuts out' the faster the motor goes. Eventually the motor gets full battery voltage for high speed.

Over time, and knowing a two-wire will work on ALL cars, the three wire motor became harder to find and much more costly.

Check out the difference in these two motors HL&B on the switches = Hi, Lo, Bat:

The resistor is close to the motor just under the duct. (Much later, someone got the brilliant idea of putting the resistor IN the duct. Hope this helps. - Dave
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Old 05-04-2012, 11:06 AM
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Thanks that was good to find out ,I didn't see anything on the two wire motor.I have 2 wires on the resistor on the bottom of the heater box,one that goes the the wiring harness and the other side is not connected to anything so if I connect the red from the resistor that is not connected and orange from the motor together I should have the low speed right as to the diagram it should work .

Last edited by tp tbird : 05-04-2012 at 11:12 AM.
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Old 05-07-2012, 04:01 PM
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Default Two wire heater motor

Got the two wire heater motor connected to the resistor and now I have the low and high speed on the heater switch.Thanks for the information and help.
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Old 05-08-2012, 03:21 AM
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Thanks for letting us know about your success, Thomas. AND, thanks for working on your own car. Now you're an experienced restorer for the next guy who finds a 2-wire motor, but thinks he needs a 3-wire. - Dave
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Old 05-08-2012, 10:57 AM
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GOOD Stuff!

Mine is 3 wire and works OK but if it should fail I could replace it with a 3 wire from one of the vendors for about $150.00 or a 2 wire for about $25.00. EASY decision there.

Resistors run about $10-20.00 and look like the below.

It would "seem" to be better to replace the OEM "heater coil" style with a modern resistor wired in line. Especially if going from 3 to 2 wire and have to add it anyhow.

So, what is the ohm rating of the OEM?
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