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CAN ANYONE HELP ME FIGURE OUT WHATS THIS WIRE IS

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by W900.92, Mar 13, 2021.

  1. Mar 13, 2021 #1
    W900.92

    W900.92 Bobtail Member

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    I am looking at purchasing a truck(searching online) and notice this wire disconnected. Any idea what it is? And what it does?
     

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    W900.92, Mar 13, 2021
    W900.92, Mar 13, 2021
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  3. Mar 13, 2021 #2
    jamespmack

    jamespmack Road Train Member

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    Look closer. Its not disconnect. It plugged off. Probably for optional equipment.
     
    jamespmack, Mar 13, 2021
    jamespmack, Mar 13, 2021
    #2
    mslashbar, AModelCat and lester Thank this.
  4. Mar 13, 2021 #3
    lester

    lester Midwest's #1 Feed Hauler

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    Yeah I don't think that's all that uncommon to have something like that.
     
    lester, Mar 13, 2021
    lester, Mar 13, 2021
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  5. Mar 13, 2021 #4
    AModelCat

    AModelCat Road Train Member

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    Just a blanked off plug. Nothing to be concerned about. Just about every truck on the road has blanked off plugs somewhere.

    Why have dozens of different wiring harnesses available when you can do it all with just 1 and just not use some of the plugs?
     
    AModelCat, Mar 13, 2021
    AModelCat, Mar 13, 2021
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    lester Thanks this.
  7. Mar 14, 2021 #5
    Goodysnap

    Goodysnap Road Train Member

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    That plug is the Cummins side diagnositic connection point . Cummins recommends using this connection to flash the engine ECM to eliminate clutter or disturbance on the OEM datalink. All newer Cummins engines have this connector somewhere on the engine. We call it "connecting to the 3 pin". Nexiq has the adapter to plug in direct. It is handy if you are trying to Isolate a CAN issue.
     
    Goodysnap, Mar 14, 2021
    Goodysnap, Mar 14, 2021
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