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identify parts

  1. Anyone know what this is?

    4.3 Mechanical
    I installed recently a curt trailer wiring harness On my 2011 rav4 v6 (base) and have been having a lot of problems (mostly blown fuses). But just recently a part near the t connector started smoking and eventually fell off (can be identified by following the blue and green wire). I have no clue...
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