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  •  » 65 Mustang constant voltage unit

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    8/06/2015 2:24 PM  #1

    Don H
    Active Member

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    Registered: 8/04/2015
    Posts: 3

    65 Mustang constant voltage unit

    How is the best way to test a cnstant voltage unit in a 65 Mustang.

    Thanks for any help on this request.

    Don

     

    8/06/2015 2:53 PM  #2

    John
    FYI Addict

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    Registered: 4/01/2013
    Posts: 118

    Re: 65 Mustang constant voltage unit

    Don H wrote:

    How is the best way to test a cnstant voltage unit in a 65 Mustang.

    There are two terminals plus the case which is ground.  Using a reliable meter, measure the voltage on the two terminals with respect to any ground (including the case of the IVR which is grounded).  One terminal (input) will have 12 to 15 volts on it (depending on whether the car is running, but ignition must be on in any case) and the other *should* have roughly 5V.  If it's an original mechanical type, this voltage will bounce a little above and a little below 5V if it's working properly.  If it's a solid-state replacement, the voltage should be 5V and stable.

    If you are getting 12 plus volts on one terminal and anything other than 5V on the other, the regulator is either bad or there's a short on the output side dragging it down.  If there's no 12V on the input then investigate a wiring problem (assuming the ignition switch is on).

    John

    Last edited by John (8/06/2015 2:56 PM)

     

     

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