Testing the heater blower

[bull999999]

I spent the day fixing the wiring on the 65 Mustang and everything works now expect for the heater blower. What's the best way to test it? I do have a multimeter.

 

[skywalker]

apply direct power? Seems like as logical a way as any.

 

[bull999999]

Where should I apply the power? I noticed that there are three wires that go from the switch to the blower area to the three terminals. With the key on the "on" position, all three terminals show 12+ volts.

 

[SnakeStang65]

The switch provides power to 2 seperate circuits on my 65. 12 volts comes from the igniton switch. The switch then provides power out (12 volts) to one of the 2 wires going to the blower. One high speed, one low speed. The ground is provided at the motor.

Mine is diffenrent from the 66 style and up that use a blower resistor. On this type 12 volts goes to the blower motor, then to the switch that sends it to the blower resistor, then to ground.


John

 

[skywalker]

Where should I apply the power? I noticed that there are three wires that go from the switch to the blower area to the three terminals. With the key on the "on" position, all three terminals show 12+ volts.

I meant to the blower itself. The switch positions provide for 2 different blower speeds and an off position. You should also check the amperage.

However, if you apply power directly to the 2 wires on the blower you can see if the blower is working.

 

[geegee]

I spent the day fixing the wiring on the 65 Mustang and everything works now expect for the heater blower. What's the best way to test it? I do have a multimeter.

The early '65 has a two speed motor (two 12v windings, one ground). The late '65/'66 has a single speed motor (one 12v winding, one ground).

Early. Apply ground to the black wire. Apply 12v to the red wire. Motor should spin fast. Apply 12v to the orange wire. Motor should spin slow.

Late. Apply ground to the black wire. Apply 12v to the orange wire. Motor should spin fast.

Notes on early. Fan switch provides power (+12v) to one of the two windings via the selector on the fan switch.

Notes on late. Fan switch grounds resistor in one of three positions for high, medium or low speeds. Hi is direct connection to motor ground. Medium is resistive connection to motor ground. Low is resistive connection to motor ground.

If the motor is out of the car, it can be tested directly from a battery source voltage. You can hold it in your hand. It only has the torque of a low voltage drill motor so its not hard to hang onto.