How many speeds can the fan motor be wired for?
Most motors are single speed but can have as many as 4 speeds (3 is typical for direct drive indoor blowers on most furnaces).
What is a 4 speed motor?
A 4-speed blower motor is a device commonly found in the HVAC (heating, ventilation and air conditioning) industry. These blower motors are used in electric heat furnaces and some air conditioning units. These motors use multiple internal coils to provide multiple fan speeds. This is why these units have many wires.
What causes a blower fan to not work?
When this happens, you may notice that you will not feel anything blowing out of the vents at all. This may also cause the blower motor to work intermittently. A blower fan is connected to the negative battery terminal (also called ground) on one end and to the positive battery terminal through a blower motor resistor on the other end.
Why is there no ground on my blower motor?
It seems, too, that the black ground wire on the blower motor (accessible from just below the dash) has NO ground potential. I ghetto jumpered a 16 gauge wire from the back of the metal clip on the ground wire to the dashboard impact bar/brace and the fan turns at variable speeds with the knob!
How to wire a 3 speed blower motor?
This three speed motor is a GE 1/5 horsepower, 7.60 amp AC motor, model 18928. To wire the motor, I am using a cord, a 660V 20A 6 Terminals 4 Positions Rotary Cam Changeover Switch, and a uxcell AC 600V 10A Red Mushroom Emergency Stop Push Button Switch 22mm NO NC. This wiring is very standard for many different makes of 3 speed AC motor.
Is there a red wire on the blower fan?
This is a 1995 Suburban K2500 4×4 6.5 TD. There isn’t a red wire at the fan. On the blower itself there is a purple wire (+12v whenever the blower speed is anywhere other than ‘off’) and black wire which should presumably be ground. I have tested the black wire for continuity to ground and theres almost none at all.