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Thread: Where is this #70 Time limit switch located on a '69S??????

  1. #1
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    Where is this #70 Time limit switch located on a '69S??????

    'Don't see this gizmo anywhere- What shape and color is it?



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  2. #2
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  3. #3
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    sorry i looked at the diagram a bit better and think its this relay on the main electrical board in the engine bay.
    https://www.early911sregistry.org/fo...01-617-115-00)

  4. #4
    Senior Member beh911's Avatar
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    I believe it is one of two switches in the breather cover on top of the engine. Having two switches in the cover is a 69 only thing....

    Visual reference here:
    https://www.early911sregistry.org/fo...ature-switches
    1969 S Coupe #761
    Early S Registry #1624

  5. #5
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    Name:  Screen Shot 2020-06-21 at 9.21.30 AM.png
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Size:  389.3 KB Thank you! I found it! I'm getting current at the enrichment solenoid on the MFI pump (1969 only) whenever the key is turned to start. This current flows even with BOTH Temp switches on the crankcase breather disconnected! So I've got to backtrack 50 years of 'Chefs' to find my way back home.

    Can anyone tell me if the Yellow leads to the time switches carry the big or small spade connector and conversely which sized connecter on the time switch is "G" and "W" and what those designations mean?

    The Yellow lead looks like the 'heater' for time and the Red(s) look like the switch.

    I have a new harness in the engine bay and I need to triple-check that the big and small spade terminals are made correctly.


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    Last edited by G69; 06-21-2020 at 05:35 AM.

  6. #6
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    Sorry no idea what G or W mean but if you have a multimeter then:
    Wiring disconnected: G terminal will have some resistance between the terminal and ground (body of switch). This is the resistance of the heating element. Sorry i dont know what the ohms value will be, quite low, 3-4 ohms? depends on the wattage of the switch heater element.
    W terminal will have 0 ohms (or very close to ) to ground when the sensor is cold. It should go open circuit (no ohms reading, the term infinity is often used) when either heated in some hot water, or the G terminal is supplied with 12v and the switch body is grounded.

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