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Old 06-02-2014, 06:28 PM
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Electrical gurus I need some relay insight

I want to wire something that stays on as soon as the key is on/engine running, but I want it to shut off when I turn the headlights on. I'm sure I can do this with relays but I'm kind of having a brain fart on how to go about it. Any help?
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Old 06-02-2014, 06:51 PM
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what if we leave the KOER out of the equation just because IDK what the headlights can do with the key off on your truck ?

and just say you want the device to go off with the headlights ?

you would use the headlight power to activate a relay coil and break ground

use a 5 pin relay like the easy to find units with the 87 and 87a


Last edited by ZMANN; 06-02-2014 at 06:55 PM.
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Old 06-02-2014, 06:59 PM
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85 to ground
86 to your headlight power from switch

30 and 87a is normally closed so use this for a pass through either + or - to your device

when the coil 85 and 86 receives power it will break the circuit 30 and 87a





you would just need to find a KOER positive lead for the device and depending on the amp load yo may need another relay to isolate it

Last edited by ZMANN; 06-02-2014 at 07:03 PM.
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Old 06-02-2014, 07:52 PM
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This is a diagram of the "safest" way to wire it. Theres other ways but this would be the best
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Old 06-02-2014, 07:59 PM
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Pic didnt post
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Old 06-02-2014, 08:29 PM
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Thanks for the quick replies guys! I appreciate the help
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