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Thread: Bonnet / Door Switch sensors... How?

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    Forum Moderator Leemarksmith's Avatar
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    Default Bonnet / Door Switch sensors... How?

    How do they work basically... there's only one pin on the ones i've seen so do you just connect the earth to them, then when open it pops up it just earths, or is it something completely different...

    Could lights be wired to these. how...

    Cheers

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    Regular Member Ste's Avatar
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    The conventional door pins do indeed earth the single electrical contact when the door is opened, via the mounting screw that holds the switch into the pillar etc.

    Vectra don't have these type however, the equivavlent switch is inside the door lock mechanism.

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    Forum Moderator Leemarksmith's Avatar
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    So in theory, if i got the bonnet alarm switch and just earthed a light to it... it would light up once bonnet is raised?

    Is it really that simple... guessing it being bolted to the car completes the earth then...

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    Regular Member Robsey's Avatar
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    I don't suppose you mean that you would put a light in series with the existing bonnet switch as used by the alarm, as this would upset the signals to the alarm contact sensor...

    same effect as is often found when people fit leds in places of bulbs.

    That would not be good,

    However fitting a separate switch as follows: -
    Get a fused live feed, link to a bulb, which finally is switched to earth via the contact switch...yes that can be done.

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    Forum Moderator Leemarksmith's Avatar
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    Quote Originally Posted by Robsey View Post
    I don't suppose you mean that you would put a light in series with the existing bonnet switch as used by the alarm, as this would upset the signals to the alarm contact sensor...

    same effect as is often found when people fit leds in places of bulbs.

    That would not be good,

    However fitting a separate switch as follows: -
    Get a fused live feed, link to a bulb, which finally is switched to earth via the contact switch...yes that can be done.
    Ha cheers, so it is simple

    And no looking at a brand new seperate switch, you can get nice chrome ones with adjustable plunger for a couple of quid...


    While where on the subject of switches, how easy would it be to fit a switch to turn on footwell lights. sounds easy, but as i want them to be wired to the interior light 1st so come on with doors opening or key fob... but then a second source of power and switch to come on manually WITHOUT it turning on - or me having to turn on the interior light (if i make sense)... is it possible
    Last edited by Leemarksmith; 26th February 2010 at 22:05.

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    Regular Member Robsey's Avatar
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    This would be a little more complex, but could be done with either diodes in series with the existing door control feed to prevent looping back the voltage from the separate live to door control circuit, or you could do it via a relay from say the cig lighter and a separate feed from your chosen switched live.

    Easier to draw than to explain!!

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    Forum Moderator Leemarksmith's Avatar
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    Quote Originally Posted by Robsey View Post
    This would be a little more complex, but could be done with either diodes in series with the existing door control feed to prevent looping back the voltage from the separate live to door control circuit, or you could do it via a relay from say the cig lighter and a separate feed from your chosen switched live.

    Easier to draw than to explain!!
    Thats what i dont want to happen, feedback turning the interior lights on etc... but its a bit more complicated then i'm used to doing...

    Just fancied having them hooked up to the interior light, did all this on the astra as well as illuminating handles...

    But this time manually switchable would be good too...

    Failing that, i could just fit 2 sets of LED's pair footwell and run one set direct from siggy... but would prefer all in one set so its not too much, think it would be hard to fit 2 sets under the seats for the rears...

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    Regular Member Robsey's Avatar
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    Bear with me for 30 mins or so, and Iwill draw a quick wiring diagram for you!!

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    Forum Moderator Leemarksmith's Avatar
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    Quote Originally Posted by robsey View Post
    bear with me for 30 mins or so, and iwill draw a quick wiring diagram for you!!
    legend!!!

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    Regular Member Robsey's Avatar
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    Hows this?

    Cig lighter feed is grey / yellow I believe

    Separate live could either be black for ignition live, (cig lighter again)
    or Red wire...feed to thick red wire of radio.

    And obviously the brown goes to any metal chassis component or earth tag.

    Blue is the switched live.

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