g'day earl
my workshop manual concur's with mark's the "A" terminal is for the gen light on the regulator you will have an A, B & F terminal if you put your test light on all three you will find one has power even when the ignition is off if memory serve's it will either be A or B that is live & keeps the coils in the reg energized which would cause your problem.
hope that helps my friend. catch ya.

moz. geelong victoria australia.
graduate 1980, bus, truck, car, hot rod, boat, submarine, hovercraft, hydrafoil, firetruck, mobile home, jet, helicopter, cruise ship, motorcycle, bicycle, santa's sleigh, clock, alloy bullbar, alloy fuel tank, lens, dr who's tardis, matter - anti matter warp drive buffer & y-block lover