When measuring the low speed of an indoor blower motor, where should the resistance reading be taken?

The resistance reading for the low speed of an indoor blower motor should be taken at the red wire and white wire on the motor. This is because these two wires are often connected directly to the motor's windings, and measuring the resistance between them provides an accurate indication of the motor's electrical characteristics in that specific speed setting.

Taking the measurement at this point ensures that you are assessing the motor itself, rather than other components in the system. If you were to measure elsewhere, such as at the fan relay, voltage transformer, or the indoor blower assembly, you may not obtain a true representation of the motor's resistance, as other elements could influence the reading. Measurement at the red and white wires isolates the motor from potential external influences, allowing for a precise evaluation of its condition and ensuring it is operating within the expected parameters for low speed operation.