TEST 2: Applying Power And Ground To The Blower Motor
Applying battery power and Ground to the blower motor (to see if it runs) is a classic test.
You'll need to use 2 jumper wires to accomplish this test since you'll be applying battery power and Ground directly from your Ranger's battery.
If the blower motor is functioning correctly, then applying battery power and Ground to it will cause it to run.
If the blower motor is defective, then applying battery power and Ground to it will not make it run or it'll run but with a lot of bearing noise.
Let's get started:
- 1
Disconnect the blower motor from its electrical connector.
The connector has 2 wires. The dark blue with light green stripe (DK BLU/LT GRN) wire supplies power and the orange with black stripe (ORG/BLK) wire supplies Ground (via the blower switch/blower resistor). - 2
Apply battery power to the blower motor.
You'll be applying power to the male spade terminal (of the blower motor itself) that connects to the DK BLU/LT GRN wire of the electrical connector. - 3
Apply chassis Ground to the blower motor.
You'll be applying Ground to the male spade terminal (of the blower motor itself) that connects to the ORG/BLK wire of the electrical connector. - 4
The blower motor should run.
Let's take a look at your test results:
CASE 1: The blower motor ran and ran without any bearing noise. This is the correct test result and tells you that your Ford Ranger's blower motor is not defective.
If the blower motor does not run when connected to the system, then there's a good chance that the blower motor resistor is bad. This tutorial will help you test it: How To Test The Blower Motor Resistor (1995-1997 3.0L Ford Ranger).
CASE 2: The blower motor ran with a lot of bearing noise. This test result tells you that the blower motor is defective and needs to be replaced.
Worn out bearings will cause the blower motor to use more current. This excess amperage draw will cause the blower resistor and/or the blower switch to burn out.
CASE 3: The blower motor did not run. This test result tells you that the blower motor is defective and needs to be replaced.
More 3.0L Ford Ranger Tutorials
You can find a complete list of 3.0L Ford Ranger tutorials in this index:
Here's a small sample of the tutorials you'll find in the index:
- Tune Up And Torque Specifications 1991-1994 3.0L Ford Ranger.
- How To Test The TPS (1993-1994 3.0L Ford Ranger).
- How To Test The Fuel Injectors (1992-1994 3.0L Ford Ranger).
- How To Test The Fuel Pump (1992-2000 3.0L Ford Ranger) (at: troubleshootmyvehicle.com).
If this info saved the day, buy me a beer!
