hi, am back in the country again * about to get back to sorting this charging problem. i have downloaded the fault finding flow chart from electrex :: which jim(san diago) told us about.my battery fully charged & left 4 a few days =12.5v but when reved to 5000 reading goes down to 11.95. it =12.5 again when switched off . problemis i need a wiiring diagram so i know im checking correct wires. is one available 4 a mc21? the v\ reg seams to have a5pin connector with 3* yellow, 1* double red,+1* green . also there are 2 * 4 pin