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Thread: Relay Wiring

  1. #1
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    Relay Wiring

    The pic below tells me that 30 and 87 is the wire I want to control. So if I cut into my 12 volt line to my back up cam, I would normally put a switch there, but I need to put a relay there. So if I attach those two ends to 30 and 87, I put the two poles of the switch on the other two posts 85 and 86?

    [IMG]three relays.jpg[/IMG]
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  2. #2
    FLAC PatO's Avatar
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    Yep.
    And don't forget a diode across 85/87.
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  3. #3
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    Quote Originally Posted by PatO
    Yep.
    And don't forget a diode across 85/87.
    No. If you put the two poles of the switch across 85/86 then that will achieve nothing.

    One of the coil connections should go to ground. The other should connect to one connection of the switch. The other connection on the switch should connect to a 12v source.

    And the diode goes across 85/86. Make sure the stripped end of the diode is connected to whichever coil connection is connected to the switch.

    Rob.

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    Thanks for answering Rob. I drew the pic just the way you described it, but it seems to me that connecting a switch directly to a 12 volt source is defeating the whole purpose of the relay. I must be missing something.


    If this pic is right, what do I do with 30 and 87? I'll worry about the diode after I understand this wiring.


    [IMG]relay wire1.jpg[/IMG]
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  5. #5
    Maximum Bitrate KyleYankan's Avatar
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    Have the cam's red lead go into 87, then attach 30 to a positive power source.

    If youre switch is big enough, why not just put that on the power line? like, a normal switch?

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    Thanks for the replay Kyle, the switch is very small, I want to build it into the steering wheel. I still don't understand how I can hook that switch up directly to the 12 volt source when it's so small.
    A pic is worth a thousand words.

  7. #7
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    Quote Originally Posted by Vee24
    I drew the pic just the way you described it, but it seems to me that connecting a switch directly to a 12 volt source is defeating the whole purpose of the relay.
    Relays are usually used when the current needed is higher than the switch's rating or the control line's output capability.

    Quote Originally Posted by Vee24
    Thanks for the replay Kyle, the switch is very small, I want to build it into the steering wheel. I still don't understand how I can hook that switch up directly to the 12 volt source when it's so small.
    Check the current rating of the switch and the current consumption of the cam and if the consumption of the the cam is less than the rating of the switch then you can just use the switch in line as you originally wanted to do.

    Rob.

  8. #8
    Variable Bitrate mp3hombre's Avatar
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    Do it the easy way:
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    Thanks Hombre, that makes sense. With this setup, do I need a diode?
    A pic is worth a thousand words.

  10. #10
    FLAC PatO's Avatar
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    Quote Originally Posted by gommino
    No. If you put the two poles of the switch across 85/86 then that will achieve nothing.
    Doh!
    Sorry about that...
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