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379 Turn signals

Discussion in 'Peterbilt Forum' started by dcrook85, May 4, 2015.

  1. May 4, 2015 #1
    dcrook85

    dcrook85 Bobtail Member

    4
    0
    Apr 30, 2015
    Arena WI
    0
    What I have is 07 379 having wiring issues. Starting with the basics im running single bucket headlights along with the led light bar as my front signals. I have 2 round double faced ones off the mirror as turn signals. and for the rear I have 4 in my center panel wired as just running lights and the mud flap brackets with 3 lights as the running lights brake lights and turn signals. The rear turn signals only work intermittenly when that happens the brake lights also dont work. I have had issues with the front not working sometimes. Could it be the front led bar is causing the rears to not function??. The midpoint signals also work fine. The last time they didnt work it was just the rears. The 2 fronts worked.
     
    dcrook85, May 4, 2015
    dcrook85, May 4, 2015
    #1
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  3. May 4, 2015 #2
    wore out

    wore out Numbered Classic

    14,333
    173,863
    Jun 5, 2013
    CHASIN THE DEVIL'S HERD
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    It's the multifunction switch. Or turn signal switch depending on which parts man you talk to. The brake lights not working at the same time gave it away. Pretty common problem
     
    wore out, May 4, 2015
    wore out, May 4, 2015
    #2
  4. May 4, 2015 #3
    dcrook85

    dcrook85 Bobtail Member

    4
    0
    Apr 30, 2015
    Arena WI
    0
    so the switch off the column??
     
    dcrook85, May 4, 2015
    dcrook85, May 4, 2015
    #3
  5. May 4, 2015 #4
    GrapeApe

    GrapeApe Road Train Member

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    Jan 7, 2013
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    That's an expensive bugger too. It is probably your issue, but before you throw money at that, the wiring goes from the MFTS (on the column), to the MFTS module (behind the center dash panel). Check it for chaffed wires. Behind the radio is a common place for wires to get pinched. Behind the glove box, the wiring loops around by the heater blower motor. It is fairly common for the 2 wire plug to the blower motor get hot and start to melt. I have seen several that melted the wires to the MFTS module. I've see intermittent light issues and lights come on for no reason from this. Depends on which wires get damaged.
     
    GrapeApe, May 4, 2015
    GrapeApe, May 4, 2015
    #4
    tmslogistics and BoxCarKidd Thank this.
  7. May 4, 2015 #5
    dcrook85

    dcrook85 Bobtail Member

    4
    0
    Apr 30, 2015
    Arena WI
    0
    Appreciate the help
     
    dcrook85, May 4, 2015
    dcrook85, May 4, 2015
    #5
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