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New to me 1999 Mack CH613

Discussion in 'Mack Forum' started by phil p, Jan 28, 2021.

  1. Jan 28, 2021 #1
    phil p

    phil p Bobtail Member

    2
    0
    Jan 28, 2021
    0
    Hello All

    I have a 1999 Mack CH613 that the head lights will not turn off when the truck is shut down.

    The normal things that cause this have been checked, the headlights are the proper part number and the parking brake is on.

    The truck came to me with wiring diagrams but without a diagram of the fuse / relay panel.

    I would surly like this drawing to identify the fuses a relays.

    Thanks
    Phil P
     

    Attached Files:

    phil p, Jan 28, 2021
    phil p, Jan 28, 2021
    #1
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  3. Jan 28, 2021 #2
    062

    062 Road Train Member

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    Oct 20, 2013
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    My guess is the headlights are on a circuit that’s only live with the ignition on.
    @Brettj3876 any ideas
     
    062, Jan 28, 2021
    062, Jan 28, 2021
    #2
    JoeyJunk Thanks this.
  4. Jan 28, 2021 #3
    phil p

    phil p Bobtail Member

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    Jan 28, 2021
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    They stay on all the time we have to disconnect the battery to turn them off.
     
    phil p, Jan 28, 2021
    phil p, Jan 28, 2021
    #3
  5. Jan 28, 2021 #4
    062

    062 Road Train Member

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    That’s what I get for thinking. Hopefully that fella I tagged before will be along shortly.
    I would pull one relay at a time until they go out. It could be the relay welded itself shut. I had that happen on a 02 Mack and it nearly caught the truck on fire.
     
    062, Jan 28, 2021
    062, Jan 28, 2021
    #4
  7. Jan 29, 2021 #5
    glensts

    glensts Bobtail Member

    1
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    Nov 25, 2007
    Aylsham, Saskatchewan
    0
    Is it only headlights or are you getting tail lights and 2 roof lights? Reason I ask is we had a harness connection that goes through drivers door by your feet corrode and melt. Causing lights to stay on. And get hot. this was on a 1997
     
    glensts, Jan 29, 2021
    glensts, Jan 29, 2021
    #5
    062 Thanks this.
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