I was looking into making a bench harness. All the ones I seen uses the OBD connector. Now my question is I have a spare cable for my V2 that goes from the OBD to the CAT5 I think. The OBD2 part is cracked. Why can't I cut that end off so that I can build a harness and just plug right into my V2 using the CAT5 end? Also as far as the 12V is concerned. Can I use the switched and unswitched from the same source? I like run one wire from the battery in my harness but then split if off into two wires which one is hot and one has a switch? Or do they have to be from different sources?