connecting to the electrical system of a vehicle which tows the wagon fig1 shows a wagon 100 to which the present invention is applicable although the invention is further described herein with respect to its utilization in a wagon it is to be understood that the invention is applicable to other devices having electrical harness wires for connecting to a source of electricity fig3 shows an elongate support member in the form of a wagon tongue 300 in accordance with one embodiment of the present invention the tongue 300 has a front portion 303 for connecting the wagon 200 to a vehicle not shown and a rear portion 307 for connecting the tongue 300 to a wagon frame 311 and steering linkage 314 of the wagon 200 the tongue 300 also includes a wiring harness 322 for electrically connecting the wagon 200 to the vehicle fig4 shows a tongue tube 400 which fits inside the tongue 300 the tongue tube 400 includes several components which operate to retract and extend the wiring harness 322 from the front portion 303 of the tongue 300 the tongue tube 400 includes an elastic cord 409 an elastic cord pulley 412 and a slidable harness wire pulley 416 fig5 a and 5b show top and.