Question about Ford F-350

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I have a 2001 Ford Chassis Rexhall American Clipper motor home powered by a v10. The heater motor only works at high speed. I have replaced the fan switch, no change. I replaced the resister. No change. The fan still only works on high speed. Both AC and regular fan will work at high speed only. I don't know what "model" to choose below. The motor home is a 32 foot A class.

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  • jeffchristia Aug 20, 2010

    I don't actually know if it is a F350 or not. These things are not identified as far as I can tell. It could be a F450.

  • jeffchristia Aug 21, 2010

    Yes, I thought of the connectors as well. In this instance, they are very clean, no evidence of any burning or scorching or shorting at all. All wires are strongly connected, nothing frayed, or loose in any way. They make very solid contact when inserting them, there is no doubt that good contact is being made. There has to be something else in the circuit that is causing the problem. Both the new switch and the new resistor are in the circuit.

  • jeffchristia Sep 02, 2010

    OK, I have now tried three resistors in addition to the original. All show power at all points when the switch is in the all on position.

    I am attaching a photo of the connector that goes to the resistor, in case the wiring is somehow incorrect.

    When I just check the connector itself (with the resistor out of the equation), I get the following results at each setting of the fan switch on the dash:

    Low .............. Orange hot, Green, Orange and Black dead
    Med/Low ....... Green and Orange hot, Yellow dead, Black dead
    Med/High ....... Green, Orange, Yellow hot, black dead
    High ...... Green, Orange hot, Yellow dead, black dead

    What do you think?

    The resistors all produce the same results. Two are from one company, the third is from a second company.

    Wiring wrong?


  • jeffchristia Sep 03, 2010

    Maybe I am misunderstanding. Every setting on the dial has at least one hot wire leading to the resistor. The list of what is hot and what is dead for each setting is included in my last email. There are no settings where everything is dead.

    I included the photo because it seems possible (maybe) that the connection is somehow not wired properly; that is, the wrong wires are connected to the wrong poles that connect then to the resistor.

    I do not understand your last suggestion. Can you please clarify in light of the foregoing?




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  • Ford Master
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I would replace the connector for the switch and the resister,sometimes the connector is at fault,you may be able to tell by looking at them.It will be in one or both connectors,they are bad to burn,and not make a good connection.

Posted on Aug 20, 2010

  • 4 more comments 
  • Ronny Bennett Sr.
    Ronny Bennett Sr. Aug 21, 2010

    Have you checked the voltage on lower speeds at the blower motor?This needs to be checked,the blower can be bad,and will not run on lower speeds.Then if this checks out to a dead end,check ,with a test light ,voltage at the switch,and the resister,and then the blower motor.Let me know,I want to help.

  • jeffchristia Aug 23, 2010

    OK, I have a volt meter that I will take to the MH in a couple of days and check this out, and get back to you.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Aug 23, 2010

    Ok,a test light would do fine,and they are cheap,if you can use one of them,but let me know how you come out.

  • jeffchristia Aug 28, 2010

    Hi, have checked voltage at the resistor, and have changed the connection to the resistor. Getting voltage on all settings at the resistor. I get voltage at the motor when the setting is on high, but nothing when the setting is on one of the lower three speeds. At the motor there is a two connection female plug, one of which is hot at the high setting as noted. The other one is dead all of the time.

    What should I do next?

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Aug 28, 2010

    The resister is at fault,it is defective take it back to get it changed out for a another one,from what you have told me,it is the resister for sure,it is just one of those things that happen,but you did good with the testing.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Sep 03, 2010

    I can not tell about the color code,but make sure with the connector loose from the resister,has one hot wire for every speed,they should light the test light,,if it does not,follow it back to the switch,and make sure there is voltage there,to the switch,and coming out of the switch on four of the terminals on the switch,this is the only way to tell,and voltage to the switch.


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