A wire harness assembly, comprising: a first shielded wire cable having a first core conductor at least partially axially surrounded by a first shield conductor which is at least partially axially surrounded by a first insulative jacket, the first core conductor having a first exposed core portion and the first shield conductor having a first exposed shield portion; a second shielded wire cable having a second core conductor at least partially axially surrounded by a second shield conductor which is at least partially axially surrounded by a second insulative jacket, the second core conductor having a second exposed core portion and the second shield conductor having a second exposed shield portion; a third shielded wire cable having a third core conductor at least partially axially surrounded by a third shield conductor which is at least partially axially surrounded by a third insulative jacket, the third core conductor having a third exposed core portion and the third shield conductor having a third exposed shield portion, wherein the first exposed core portion is sonically welded to the second exposed core portion and the third exposed core portion; a flexible insulative layer wrapped about the sonically welded first, second, and third exposed core portions; a flexible conductive layer wrapped about the flexible insulative layer and the first, second, and third exposed shield portions; characterized by a section of heat shrink tubing in which the flexible conductive layer and portions of the first, second, and third insulative jackets (124, 126, 128) are enclosed, wherein the section of heat shrink tubing is in compressive contact with the flexible conductive layer and the portions of the first, second, and third insulative jackets (124, 126, 128), and sealably engages the first, second, and third insulative jackets (124, 126, 128); and an insulative housing having a longitudinal cavity extending therethrough in which the section of heat shrink tubing, the flexible conductive layer, and portions of the first, second, and third insulative jackets (124, 126, 128) are disposed. a first shielded wire cable having a first core conductor at least partially axially surrounded by a first shield conductor which is at least partially axially surrounded by a first insulative jacket, the first core conductor having a first exposed core portion and the first shield conductor having a first exposed shield portion; a second shielded wire cable having a second core conductor at least partially axially surrounded by a second shield conductor which is at least partially axially surrounded by a second insulative jacket, the second core conductor having a second exposed core portion and the second shield conductor having a second exposed shield portion; a third shielded wire cable having a third core conductor at least partially axially surrounded by a third shield conductor which is at least partially axially surrounded by a third insulative jacket, the third core conductor having a third exposed core portion and the third shield conductor having a third exposed shield portion, wherein the first exposed core portion is sonically welded to the second exposed core portion and the third exposed core portion; a flexible insulative layer wrapped about the sonically welded first, second, and third exposed core portions; a flexible conductive layer wrapped about the flexible insulative layer and the first, second, and third exposed shield portions; characterized by a section of heat shrink tubing in which the flexible conductive layer and portions of the first, second, and third insulative jackets (124, 126, 128) are enclosed, wherein the section of heat shrink tubing is in compressive contact with the flexible conductive layer and the portions of the first, second, and third insulative jackets (124, 126, 128), and sealably engages the first, second, and third insulative jackets (124, 126, 128); and an insulative housing having a longitudinal cavity extending therethrough in which the section of heat shrink tubing, the flexible conductive layer, and portions of the first, second, and third insulative jackets (124, 126, 128) are disposed.