TEST 2: Applying Power And Ground To The Blower Motor
In this second test, we're gonna' manually apply battery power and Ground to the blower motor to see if it runs.
If it doesn't run, then you can conclude that it's defective and needs to be runs.
If it does run, but it runs will a lot of bearing noise and it's amperage draw is above 40 Amps, then you can conclude it's bad and in need of replacement.
NOTE: You'll be applying power and Ground to the blower motor's connector. This connector has male spade terminals.
These are the test steps:
- 1
Disconnect the blower motor from its electrical connector.
- 2
Apply battery power to the blower motor. You'll be applying power to the connector of the blower motor itself.
- 3
Apply chasis Ground to the blower motor. You'll be applying Ground to the connector of the blower motor itself.
- 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.
If the blower motor's amperage draw is under 40 Amps, then you can conclude that it is NOT defective.
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.
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 4.7L Dodge Tutorials
You can find a complete list of 4.7L Dodge tutorials in this index:
Here's a small sample of the tutorials you'll find in the index:
- How To Test The MAP Sensor (2000-2001 4.7L Dakota, Durango).
- How To Test The Throttle Position Sensor (2000-2007 4.7L Dodge).
- How To Test The Fuel Injectors (Dodge, Jeep 4.7L V8) (at troubleshootmyvehicle.com).
- How To Test For A Blown Head Gasket (4.7L Chrysler, Dodge, Jeep) (at troubleshootmyvehicle.com).
- How To Test The COP Ignition Coils (Chrysler, Dodge, Jeep 4.7L) (at troubleshootmyvehicle.com).
If this info saved the day, buy me a beer!
