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5 into 4 adapter

  1. 5 into 4 wiring issue

    MC Trailer Board
    I recently installed a Bushtec hitch, the Add-on isolator and an Add-on 5 into 4 adapter. It all works well with the exception that when the brake is on, the signal light does not flash on the trailer. Is this normal? I would think that it would be safer for vehicles behind you to see that...