If you want to wire the 10DN to 12SI conversion yourself, this diagram will help. Disconnect the flat, four-wire voltage regulator plug and jump the F and 4 wires together. Using a stock 12SI alternator connector, route the F wire to the No. 1 terminal and the 4 wire from the regulator to the No. 1 terminal on the alternator. M&H Electric makes a simple jumper kit that’s attractively priced and makes this conversion really simple so you don’t have to cut any wires. M&H also makes a similar kit to upgrade to a CS130 alternator.