Where is the blower motor resistor in a 03 international 9900I semi truck?

The blower motor resistor in a 2003 International 9900i is typically located behind the dashboard, near the blower motor itself. However, the exact location can vary slightly depending on the specific configuration of your truck. It's often behind a panel that requires removal to access.

Because of this variability and the complexity of accessing it, it's best to consult a wiring diagram specific to your truck's year and model. These diagrams can usually be found online through International's website (if they're still available), or through various truck repair manuals.

Do not attempt to locate or replace the resistor without first consulting the wiring diagram. Working on a vehicle's electrical system can be dangerous if done incorrectly. If you're not comfortable with automotive electrical repair, it's best to take your truck to a qualified mechanic.