For those who already have a Delco "SI" Alternator, and are looking to rewire their Tractor, our 12V conversion kit for the D10/12 model Tractors is as easy to install as tying your shoes. All new switches, Voltmeter to replace the Ammeter for safety and more accurate voltage read outs, 12V Coil, hardware packets and wiring nomenclature come with this kit. Add your Alternator, and tie it into our system and viola! Your done. One gauge heavier wire rids the system of voltage drop to components.  Don't guess. Get the best! B&B wiring systems!