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Electrical probs

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by DaveHab, Mar 2, 2020.

  1. Mar 2, 2020 #1
    DaveHab

    DaveHab Bobtail Member

    3
    1
    Mar 2, 2020
    0
    Here's one for the skilled. 2013 Cascadia turn signal bulbs. Both lt. and rt. And just the front. With the marker lights on and the filaments lit. if you pull the brake valve or step on the brake pedal the turn signal filiments light too. Release them and they go out. everything else works as advertised. No corrosion on the connectors. No obvious defects, bulbs, wires, fuses, modules, no codes for ECU. What crossovers, if any, there are? Any one seen this or have any suggestions?
     
    DaveHab, Mar 2, 2020
    DaveHab, Mar 2, 2020
    #1
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  3. Mar 2, 2020 #2
    stillwurkin

    stillwurkin Road Train Member

    1,756
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    Dec 2, 2017
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    Did you just connect to a different trailer? Have hooked to a trailer and makes turn indicators light when activating brake lights. If so spray a shot or two of brake cleaner in the female electrical plug to the trailer. Sometimes that works. Also unplug your trailer cord ( assuming your not btail) see if the problem disappears. Sure could be something else for sure..after all it is a truck lol.
     
    stillwurkin, Mar 2, 2020
    stillwurkin, Mar 2, 2020
    #2
  4. Mar 2, 2020 #3
    mslashbar

    mslashbar Medium Load Member

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    Jul 22, 2009
    elizabeth,co
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    Could be a bad ground somewhere, a bad ground can cause wierd problems.
     
    mslashbar, Mar 2, 2020
    mslashbar, Mar 2, 2020
    #3
  5. Mar 2, 2020 #4
    McMahons Trucking

    McMahons Trucking Light Load Member

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    Jul 4, 2018
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    99% of issue like this are bad grounds.
     
    McMahons Trucking, Mar 2, 2020
    McMahons Trucking, Mar 2, 2020
    #4
  7. Mar 2, 2020 #5
    DaveHab

    DaveHab Bobtail Member

    3
    1
    Mar 2, 2020
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    It is just a bobtail problem.
     
    DaveHab, Mar 2, 2020
    DaveHab, Mar 2, 2020
    #5
    stillwurkin Thanks this.
  8. Mar 2, 2020 #6
    DaveHab

    DaveHab Bobtail Member

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    1
    Mar 2, 2020
    0
    And no obvious grounds. What gets me is the connection to the front turns from the brake light/switch. And not the rears too.
     
    DaveHab, Mar 2, 2020
    DaveHab, Mar 2, 2020
    #6
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