I have an Exid model ES3-24-550 charger, I need to change input voltage fro 480v 3ph to 208volt 3ph. there are 6 leads to each transf. ph.Each terminal block is lableled 1 through 6. with jumper on terminal 3&4. Line 1 and line two of the 480 are tied to 1 and 6. There are three small transf. that are tied across 1 &2 of the termianl block. which go to a circuit board.