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Joe Robinson
Joe Robinson Posted on May 16, 2011
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IS THERE A BALLAST RESISTOR FOR THE BLOWER MOTOR. THE MOTOR IS FINE BUT IT WILL NOR WORK

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John May

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  • Expert 111 Answers
  • Posted on May 16, 2011
John May
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Joined: Feb 22, 2011
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Hi I will try and help you if i can.
Yes, there will be a resistor pack that controls the speed of the blower motor.
Usually on a 4 speed motor there will be three resistors.
When 4 speed is selected the motor gets full 12volts ( no resistors used )
When 3 speed is selected the motor gets its Voltage via 1 resistor ( reducing the speed )
When 2 speed is selected the motor gets its Voltage via 2 resistors ( reducing speed even more )
When 1 speed is selected the motor gets its Voltage via 3 resistors ( giving the lowest speed ).
Usually when the resistor pack burns out the motor will work but only on no.4 speed which does not use the resistors.
So i think your problem might be the control switch.
Ihope i have been of some help to you.
John ( South Wales UK )

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