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Mack electrical question.....

Discussion in 'Mack Forum' started by chalupa, Jan 10, 2013.

  1. Jan 10, 2013 #1
    chalupa

    chalupa Road Train Member

    3,757
    1,640
    Jul 22, 2010
    Houston,Texas
    0
    My CH dog has decided to eat a fan switch about every 6 months. Always the same thing too. High speed wire overheated and switch breaks at blade connection.

    All this despite a new motor and cage and a clean plentiful air flow.

    You could say the wire is too small but its the factory wiring......... I just dunno.

    Got any ideas?
     
    chalupa, Jan 10, 2013
    chalupa, Jan 10, 2013
    #1
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  3. Jan 11, 2013 #2
    CondoCruiser

    CondoCruiser The Legend

    19,726
    18,731
    Apr 18, 2010
    Tennessee
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    A poor ground or connection will cause power surges/heat. Double check the block to chassis ground strap. Sometimes corrosion can hide under the lug or the bolt is a hair loose.

    Usually smaller wires energize a relay which connects the bigger wires together on long runs. Look under the hood for a relay panel.
     
    CondoCruiser, Jan 11, 2013
    CondoCruiser, Jan 11, 2013
    #2
  4. Jan 11, 2013 #3
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

    1,780
    1,726
    Jun 14, 2009
    romulus,mi
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    i service a fleet of these,and it is the most common issue.over the last 5 years i have not found a solution besides replacing the switches.lucky they are cheap.sorry!
     
    QUALITYTRUCK, Jan 11, 2013
    QUALITYTRUCK, Jan 11, 2013
    #3
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