Relay wiring question

Discussion in 'Technical' started by HarleyGA, Aug 11, 2017.

  1. jbrich

    jbrich Johnny

    Joined:
    Feb 15, 2017
    Messages:
    123
    Likes Received:
    22
    Trophy Points:
    61
    Garage:
    1
    Location:
    Atlanta
    Vehicle:
    72 Maverick
    Hi HarleyGa,
    It sounds like the relay is operating mechanically.
    In this simple circuit, A test light should be A little easier than A meter to use for troubleshooting, but either will work.
    You are looking for the presence or absence of voltage, rather than A specific level (at the input and output).

    The 'click' you hear is the mechanical operation of the relay switch (energizing), connecting terminal 30(input to the relay switch) to terminal 87(output of the relay switch).
    As wired, +12V should be present at term. 30 at all times, and +12V at 87 only when the relay is energized.
    Make sure your test equipment is referencing (connected to) A good ground.

    There should be no voltage drop across (measured between) 30 and 87. The voltage will be referenced to ground. Neither of those contacts should be at ground potential.

    In summary, check for voltage at the input and output of each component, conductor and connector.
    Start at one end of the circuit and work to the other end, or "half split" the circuit by starting in the middle (at terminal 30 of the relay). And work backward until you find A good 12V or forward to the place where the voltage is no longer present.

    It's more simple in practice than it seems in print.

    P.S. If these are not high output lights, the relay shouldn't be necessary. Assuming the acc. circuit is not already loaded near its limit.
     
  2. HarleyGA

    HarleyGA Member

    Joined:
    Jan 30, 2012
    Messages:
    403
    Likes Received:
    43
    Trophy Points:
    88
    Location:
    Acworth, GA
    Vehicle:
    73 Grabber,
    Solved. I purchased a five pack of these relays (pic) thru Amazon. It turns out that all five were defective. Bought a new one from Advance Auto, plugged it in and the grill lights worked. I still cant believe all five were bad. Important lesson learned. Thank you for the time and effort all of you took to help. 81u-rlPzuYL._SL1500_.jpg
     
  3. yellow75

    yellow75 MCCI Oregon State Rep Supporting Member

    Joined:
    Jun 10, 2004
    Messages:
    4,777
    Likes Received:
    1,160
    Trophy Points:
    587
    Garage:
    2
    Location:
    Tillamook Oregon
    Vehicle:
    72 Maverick 1976 Maverick Stallion 2007 Shelby GT 500 2019 Ford F150 FX4 2023 Bronco
    Glad you got it fixed, was the relay you bought from advance auto the same with five plugs on the relay
     
  4. HarleyGA

    HarleyGA Member

    Joined:
    Jan 30, 2012
    Messages:
    403
    Likes Received:
    43
    Trophy Points:
    88
    Location:
    Acworth, GA
    Vehicle:
    73 Grabber,
    Yes it was a five plug. The brand is BWD and the part number R3074.
     
  5. 71gold

    71gold Frank Cooper Supporting Member

    Joined:
    Apr 9, 2002
    Messages:
    26,549
    Likes Received:
    2,917
    Trophy Points:
    978
    Garage:
    1
    Location:
    MACON,GA.
    Vehicle:
    '73 Grabber
    that's crazy...:bouncy:
     
    Last edited: Sep 12, 2017
  6. COMETIZED

    COMETIZED Member

    Joined:
    Feb 4, 2008
    Messages:
    1,671
    Likes Received:
    542
    Trophy Points:
    288
    Location:
    Florida
    Vehicle:
    70 Mav. 74 Comet
    Just Curious :
    WHERE were these fine looking automotive relays MANUFACTURED ? Dare I guess ??
    Cometized
    (Chip)
     

Share This Page