Blower motor Resistor - Impala Tech
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post #1 of 8 (permalink) Old 03-07-2016, 07:17 PM Thread Starter
 
 
Join Date: Jul 2015
Location: Massachusetts
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Blower motor Resistor

I'm replacing the engine wire harness in a 69 Impala. What I believe is the connection to the blower motor had a ceramic resistor on the old harness. Unfortunately the ceramic is broken. Can anyone tell me if this is in fact a resistor to the blower motor, and if the is anywhere they would be available.

Thanks for any help

http://s809.photobucket.com/user/dan...g.html?filters[user]=143838978&filters[recent]=1&sort=1&o=2

http://s809.photobucket.com/user/dan...g.html?filters[user]=143838978&filters[recent]=1&sort=1&o=3

http://s809.photobucket.com/user/dan...g.html?filters[user]=143838978&filters[recent]=1&sort=1&o=1
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post #2 of 8 (permalink) Old 03-07-2016, 10:35 PM
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Your Photobucket links aren't working. Try again please. We should be able to help you.

Chris
Warrenton, OR
'68 CJ-5 - Sold
'74 Nova
'10 Camaro
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post #3 of 8 (permalink) Old 03-08-2016, 06:20 AM Thread Starter
 
 
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After searching last night, this may be the ignition ballast resistor, but I don't know why it would have been on the blower motor connector. I did not take this car apart, and am trying to piece things together. I have not yet found a diagram showing how the ballast resistor is wired. I believe this is a RU10 or RU11

http://i809.photobucket.com/albums/z...ps7rtrk8lz.jpg

http://i809.photobucket.com/albums/z...pstq3ryg7r.jpg

http://i809.photobucket.com/albums/z...psbpib9jdm.jpg
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post #4 of 8 (permalink) Old 03-08-2016, 06:05 PM
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Quote:
Originally Posted by dansull View Post
After searching last night, this may be the ignition ballast resistor, but I don't know why it would have been on the blower motor connector. I did not take this car apart, and am trying to piece things together. I have not yet found a diagram showing how the ballast resistor is wired. I believe this is a RU10 or RU11

http://i809.photobucket.com/albums/z...ps7rtrk8lz.jpg

http://i809.photobucket.com/albums/z...pstq3ryg7r.jpg

http://i809.photobucket.com/albums/z...psbpib9jdm.jpg

Yes, it's the ballast resistor.
Do you have A/C in the car or is it just heat?

Chris
Warrenton, OR
'68 CJ-5 - Sold
'74 Nova
'10 Camaro
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post #5 of 8 (permalink) Old 03-08-2016, 06:32 PM Thread Starter
 
 
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Just heat, no AC.
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post #6 of 8 (permalink) Old 03-08-2016, 11:52 PM
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Quote:
Originally Posted by dansull View Post
Just heat, no AC.
If it's like any other gm car of that time, the heater fan resistor will be inside on the top of the heater box. It'll have 3 wires going to it. I'm on my phone, I'll see if I can find a drawing or something.

Chris
Warrenton, OR
'68 CJ-5 - Sold
'74 Nova
'10 Camaro
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post #7 of 8 (permalink) Old 05-28-2016, 11:31 AM
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Sorry, I ended up brain dead and didn't follow through with what I said I would do. Here's a diagram for a 66 Impala, they should be the same. The resistor is center bottom.


http://2.bp.blogspot.com/-lhCNcETcHC...ng+Diagram.jpg

Chris
Warrenton, OR
'68 CJ-5 - Sold
'74 Nova
'10 Camaro
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post #8 of 8 (permalink) Old 05-28-2016, 12:01 PM
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Chevy's haven't used a ceramic resistor since 1957. The resistor is a small 22 gage Ni-chrome wire in the ignition wiring.


The blower motor uses one or two resistors leading from the fan switch to the blower motor to control the blower motor's fan speed (vary the voltage to a permanent magnet DC motor and you vary the speed, reverse the polarity and it spins backwards). You have one resistor for each speed below fastest. What the value is I do not know but they have used twelve volts since 1946 in Chevy cars so the resistance will be the same to obtain the same rotational speed with 12 volt input.


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