knot in the electrical wire

affiliation apparatus appliance appliances bad blunder botch botcher brake break broken cable cables circuit circuitry circuits circumferential colored colour coloured communication communications complex complicated computer computers conductors connect connected connecting contact contacts convoluted counter current data decipher defective detail details device electrical electronic electronically electronics element error fix guided knot knotted knotty labyrinthine line lines maintenance node objectionable out part power problem problematic problematical problems ravel repair revision service setup signal swirly tangled unfix unravel unsnarl unwinds wire wired wires