Ranger 2WD V6-182 3.0L (1995)
Blower Motor: Testing and Inspection
Blower Motor Current Draw Test
1.
Disconnect the electrical wire harness from the blower motor.
2.
Connect ammeter such as Rotunda 73 Digital Multimeter 105-00051 or equivalent, between the right (positive) terminal on the blower motor
and the corresponding terminal of the wire harness connector. Connect a jumper wire between the left (ground) terminal on the blower motor
and the corresponding terminal of the wire harness connector.
3.
Place the system temperature control knob in the med-range position (halfway between COOL and WARM) and the function control knob in
VENT position (air through registers).
4.
With the battery fully charged, start the engine and operate the blower motor in all speeds. Record the current draw for each speed.
5.
The current draw for each speed should be within the limits shown in Specifications.
6.
Disconnect the ammeter and jumper wire, reconnect the harness connector to the blower motor.
7.
Check the system for proper operation.
Open Circuit Test
Electrical circuits are used to control the blower motor.
The heater blower motor switch and heater blower motor switch resistor are connected between the blower motor and ground. Battery voltage is
available at the blower motor whenever the ignition switch is ON.
On all electrical circuits, continuity must exist from the source of power (battery), to the unit where the power is used, and back up to the source of
power (ground). A check at each connection in a circuit, starting at the battery, will locate an open circuit or will show that the circuit is complete.
Refer to the electrical schematic in the applicable section.
An ohmmeter or self-powered test light connected at any two points of a circuit with the power removed from the circuit will show if the circuit
between the two connections is open or continuous.
If the meter does not move, or has a slight movement, (high resistance), the circuit may have a poor connection or broken wire. If the bulb does not
light, the circuit is open.
If the meter movement is great or full (low resistance), the circuit is complete. If the bulb lights, the circuit is continuous.
