INSTALLING A NEW WIRING HARNESS | MG TD TF 1500 | MG MG TD TF 1500 INSTALLING A NEW WIRING HARNESS BBS discussion. MG TD TF 1500 - INSTALLING A NEW WIRING HARNESS. including mine, another TD and a Mk II. After I install the wires I may clean up the installation a bit by shortening the wires where needed (such as around the voltage regulator) tinning the exposed ends, and reinstalling New wiring harness install | MG TD TF 1500 | MG-Cars MG TD TF 1500 New wiring harness install BBS discussion. If you have and can follow a wiring diagram, it's easy. The main thing to make a note of, and maybe a few photos, is the route that the loom takes and where and how it is clipped / attached to the chassis.