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The 2004-2008 F-150 truck was introduced in January 2003 for the 2004 model year as the redesigned eleventh generation of the F-150 lineup.

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Howdo I narrow down whether its the resistor or the speed control swit

I have power to the motor. And have checked it with voltmeter. Replaced the resistor. No luck there so I checked the speed control switch and it is melted a little on the connector and there isn't any resistance on the switch. I tried jumping the switch but nothing happened there either. So now I want to check the connector on the resistor. However I can't find an help with that.

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Hi @fordfun ,

Do you mean the blower motor resistor?

Here is an image from the repair manual, showing the circuit for a 2005 F150 auto and manual A/C blower motor and motor resistor.

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(click on image to enlarge for better viewing)

Here is the rest of the repair manual in case you need more information.

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