From the Reference Section:
- How to wire the Switch Pitch on a Buick Transmission
- 1950 Wiring Diagrams
- 1951 Wiring Diagrams
- 1952 Wiring Diagrams
- 1955 Wiring Diagrams
- 1957 Wiring Diagrams
- 1964 Wiring Diagrams
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- 1967 Wiring Diagrams
- 1968 Wiring Diagrams
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Thread: ST300 Wiring

  1. #1
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    ST300 Wiring

    I am building a 64 Skylark and found that the wiring from the trans was cut and laying on the exhaust and melted. There are two wires, black and white. Where are the supposed to connect on the harness or plug? Just rewired the car with a Speedway universal harness and want to be sure I have the pitch working in the ST300. Thanks for any info on this.


    Chris

  2. #2
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    They connect to a switch like this one.

    Loren@65GS.com
    Attached Images Attached Images

  3. #3
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    Black wire goes to the switch the pitch solenoid valve in the ST300. White wire goes to the downshift solenoid valve. Carburetor down shift switch energizes black wire first, then white wire as accelerator pedal is depressed. A yellow wire from the harness feeds power to the downshift switch.

    A jumper harness brings the yellow and black wires over to the idle stator switch on the dashpot bracket. Idle stator switch energizes the switch the pitch circuit at idle to reduce vehicle creep.

    See attached pages from the shop manual showing connections and adjustments.
    Attached Images Attached Images
    What has been, can be again. (Bob Wills, 1942)

  4. #4
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    Thanks for the info. I will try to look at it this week.

  5. #5
    There is a full set of '64 wiring diagrams in the Reference section. Click on '64 on the "Years" table.

    This is the one you are probably looking for:
    https://www.teambuick.com/reference/...ing_10-102.php


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  6. #6
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    Thanks Bob!

    One other question on this. It seems as I have no device for a switch device on the car. Did any cars not come with a switch-pitch switching device on a 1964 Skylark? I see some people say that this did not start until 65. If that is the case, where would the wiring go or is it even needed?

  7. #7
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    There would have been no switches if the engine came from a synchromesh car.

    The ST300 was the only automatic offered on intermediate-size Buicks in '64. If the ST300 has two wires coming out of it, there should have been two switches up on the carb linkage to feed in power. Switches could have been discarded if intake manifold or carb was ever swapped out. Car will run OK 95% of the time with wires disconnected. But driver could get in trouble passing someone on a two-lane highway trying to get around in a hurry with the downshift solenoid inoperative.

    The ST400 used in some full-size cars did not have switch-the-pitch in '64, but got it in '65. That's probably what the other guys referred to. Still there would have been a downshift switch on the carb linkage for those '64s.
    What has been, can be again. (Bob Wills, 1942)

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