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    Results 1 to 5 of 5
    1. #1
      Join Date
      Aug 2013
      Posts
      4
      Country Flag: United States

      Basic Relay Question

      I'm chasing a parasitic drain of 0.8 Amps in my 67 Camaro with an LS3. Removing certain fuses, I see .2 drops across a couple of circuits in my AAW wiring harness and am wondering something simple:

      I have relays powering windows, trunk release, etc. Does a relay consume current when not in use if hooked up to the battery (vs ignition)?



      Thanks for any help,

      Bill


    2. #2
      Join Date
      Sep 2010
      Location
      Beach Park IL
      Posts
      2,588
      Country Flag: United States
      A relay will only draw current when the coil is energized. Terminals 85 and 86 are the coil connections.
      Donny

      Support your local hot rod shop!

    3. #3
      Join Date
      Aug 2013
      Posts
      4
      Country Flag: United States
      Quote Originally Posted by dontlifttoshift View Post
      A relay will only draw current when the coil is energized. Terminals 85 and 86 are the coil connections.
      IF I have batt power going to the 30 pin with the 85 pin grounded, I am finding that it draws about .2A. Is this consistent with how they should operate?

    4. #4
      Join Date
      Jul 2008
      Posts
      279
      Country Flag: United States
      Is this a 5 pin relay? Is there a pin 87A? If so, that's where your drain is.

      When a 5 pin relay is de-energized pin 30 makes contact with 87A. It's normally closed.
      When any relay is energized pin 30 makes contact with 87. It's normally open.

      Found this image doing a quick search. If you can make it out you can see pin 30 is normally connected to 87A until the relay is energized, then it disconnects from 87A and connects to pin 87.

      Name:  unnamed.gif
Views: 80
Size:  12.7 KB

      *EDIT* No, that is not how a relay works. Pin 85 is for the coil of the relay, only other connection to pin 85 is 86, that's the coil
      *Jeff*
      Project Salty - 1964 4 door Malibu, beaten, neglected, red headed foster child
      Cammed LQ4 / T56 Swap Project Thread <-click to read! 😁

    5. #5
      Join Date
      Aug 2013
      Posts
      4
      Country Flag: United States
      Quote Originally Posted by Hotwire View Post
      Is this a 5 pin relay? Is there a pin 87A? If so, that's where your drain is.

      When a 5 pin relay is de-energized pin 30 makes contact with 87A. It's normally closed.
      When any relay is energized pin 30 makes contact with 87. It's normally open.

      Found this image doing a quick search. If you can make it out you can see pin 30 is normally connected to 87A until the relay is energized, then it disconnects from 87A and connects to pin 87.

      Name:  unnamed.gif
Views: 80
Size:  12.7 KB

      *EDIT* No, that is not how a relay works. Pin 85 is for the coil of the relay, only other connection to pin 85 is 86, that's the coil
      Makes sense. I'll check the 87A. They are 5 pin but I don't think there is anything connected to any of the 87a pins. Thanks for the clarification.