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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » Had my AC wired to a constant hot power source.

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    7/04/2025 10:27 AM  #1

    RTM
    Senior 24-7 FYI Addict

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    From: Cape Coral FL
    Registered: 5/22/2019
    Posts: 2,028

    Had my AC wired to a constant hot power source.

    Well I never paid attention to the upgraded harness fuse block.  I just assumed it was all ignition powered.  Turns out only the red blocks are fused which is clear as day on the electrical drawing.   I just never caught it.   I first notice my blower motor would stay on.  So I just turned the AC switch on the dash to off.  Then I noticed my fan was staying on.  Then it hit me.  The constant power had left the system powered with the key off and the pressure switch was sending power to the fan controller.   I just moved the power wires to the red blocks and all it well.   The one picture shows the two red AC wires in the correct location now. 


     

    7/05/2025 5:08 AM  #2

    BobE
    Senior 24-7 FYI Addict

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    From: White Plains, NY
    Registered: 4/04/2013
    Posts: 2,889

    Re: Had my AC wired to a constant hot power source.

    Good thing that you found it now.

    65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
     

    7/05/2025 8:00 AM  #3

    rpm
    Senior 24-7 FYI Addict

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    From: Bakersfield, Ca
    Registered: 9/17/2013
    Posts: 3,855

    Re: Had my AC wired to a constant hot power source.

    It sounds like you had me wire your car.

    Bob. 69 Mach 1, 393W, SMOD Toploader, Armstrong  steering, factory AC.
     

    7/05/2025 3:28 PM  #4

    RTM
    Senior 24-7 FYI Addict

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    From: Cape Coral FL
    Registered: 5/22/2019
    Posts: 2,028

    Re: Had my AC wired to a constant hot power source.

    rpm wrote:

    It sounds like you had me wire your car.

     
    Lol

    In my defense, this was the biggest electrical job I've ever done.  I learned a lot on this build.

       •Thread Starter
     

     

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  •  »  Had my AC wired to a constant hot power source.

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