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Relay help

Discussion in 'Technical Chat' started by Karo, May 25, 2010.

  1. May 25, 2010 at 10:24 PM
    #1
    Karo

    Karo [OP] Well-Known Member

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    Karo
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    I need some help understanding the concept of a relay. Why not splice additional wires instead? Can I mess up my trucks wiring system entirely by not connecting to the right pins on the relay? Can anyone please explain its functions more thoroughly?
     
  2. May 26, 2010 at 5:36 AM
    #2
    EnolaGaia

    EnolaGaia Well-Known Member

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    01 SR: Double Cab conversion, S/C, lowered.
    A relay is basically a remote-control switch. It has 2 circuits inside - (a) the main switched circuit being activated / closed by the relay's action and (b) the actuator (that 'flips the switch' on the main circuit).

    A relay allows you to use a low-power 'signal' to trigger activation of the main circuit. If the main circuit has a lot of power on it, the use of a relay reduces voltage load on your control circuits.

    It's possible to damage a relay if the main circuit is relatively high-powered and you put the high power through the relay's trigger / activation circuit.
     
  3. May 26, 2010 at 6:37 AM
    #3
    FreeHeel

    FreeHeel Not Dead But Definitely Dying

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    Is there a specific project you are working on?

    A simple example would be wiring up fog lights. If you did not use a relay (30 amp in my project) you would then have all that current running directly through the switch on the dash. That would require a super heavy duty switch or you would run risk of burning the switch up.
     
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