Quick auto sparky qu. Relays.

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  • Quick auto sparky qu. Relays.
  • Premier Icon Stoner
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    I have two relays that I want to close with a single closed circuit.

    So I though I could connect the relays in series. I thought it made sense. But it appears not so.

    If I connect ground at “X” and apply live to point “A” I can close switch 1. But it doesnt close switch 2.

    If I apply live to point “B” I can close switch 2, but not 1.

    Is there electrcikery inside relays effectively preventing this from working as I think? Obviously I just need to connect them in parallel instead, but just wanted to check.

    Cheers for any pointers.

    Premier Icon paladin
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    Is b earthed somehow?

    if they are 12V relays you;d just be best to connect the relay supplies to 12V in parallel, the switching side can still be in series if that is important

    Premier Icon lerk
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    I’m surprised either of them work, you’re only dropping 6v onto a coil which needs ~10v minimum to close the relay!

    Premier Icon paladin
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    Thinking about it, I’ve never seen relays wired in series like this (on ships), 1 relay would surely do what you’re trying to achieve in that picture?

    Premier Icon Stoner
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    I’m surprised either of them work, you’re only dropping 6v onto a coil which needs ~10v minimum to close the relay!

    Mwah. Love you.
    I was being dumb and didnt really twig that it needs the full voltage to work!

    Thanks. Will wire in parallel.

    Chuffed that my heated windscreen test rig with a 10m timer works perfectly. momentary live for on, momentary live for off, or 10m delay auto off!

    I need 2 relays as I need 2x 30A, one to each side of the screen.

    Premier Icon paladin
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    Ah right, so switches 1 and 2 won’t be wired in series like in the picture?

    Premier Icon Stoner
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    good point. no they wont.
    Although for the purposes of the illustration it doesnt matter.

    Premier Icon lerk
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    Jaysus! Put a fuse in the line would ya… I take it you’ve never seen a shorted cable of that size connected across a battery of that size!
    You don’t get much chance to stop it manually!

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