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  1. #1
    Join Date
    Feb 2015
    Location
    Conwy
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    4,242

    Default Idle safety switch on analogue cable based Volvo controls

    I removed the throttle shift levers to make an adjustment on the switch that was beginning to fail and managed to tear a connection pin out of the microswitch.
    To start the engine I have to briefly make contact with the two wires.

    How does this system work? i.e. what does the neutral safety switch disable to prevent the engine starting and is it safe to leave disconnected apart from a brief touch while starting to enable whatever it does until I can replace it, or should I make good a temporary connection between the two wires?

    thanks in advance
    Last edited by BruceK; 21-10-19 at 12:59.

  2. #2
    Join Date
    Apr 2008
    Location
    Isle of Man
    Posts
    2,137

    Default Re: Idle safety switch on analogue cable based Volvo controls

    Stops you starting it in gear I think

  3. #3
    Join Date
    Feb 2015
    Location
    Conwy
    Posts
    4,242

    Default Re: Idle safety switch on analogue cable based Volvo controls

    In addition to the above is there a specified gap that needs to be observed when replacing the switch. I replaced my control unit levers and that was the point the switch started behaving erratically.

  4. #4
    Join Date
    Feb 2015
    Location
    Conwy
    Posts
    4,242

    Default Re: Idle safety switch on analogue cable based Volvo controls

    Quote Originally Posted by FARSCO View Post
    Stops you starting it in gear I think
    Yes, we appreciate that, but what does in enable or disable to do so.

  5. #5
    Join Date
    Feb 2015
    Location
    Conwy
    Posts
    4,242

    Default Re: Idle safety switch on analogue cable based Volvo controls

    Sorry thread title should have said Neutral safety switch

  6. #6
    Join Date
    Dec 2001
    Location
    north ayrshire
    Posts
    495

    Default Re: Idle safety switch on analogue cable based Volvo controls

    The switch interrupts the start circuit from the ignition IE it prevents you sending 12v to the starter solenoid ,once the engines running that circuit is doing nothing. Ifyou switch off again you wont be able to restart. You could just link the two wires permanently or replace the start in gear switch, eiter will work provided you are confident you wont start in gear with the throttle fully open

  7. #7
    Join Date
    Feb 2015
    Location
    Conwy
    Posts
    4,242

    Default Re: Idle safety switch on analogue cable based Volvo controls

    Thanks. Just one more short trip to the hard and then I can replace at my leisure

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