The battery is not charging on my 2011 EZGO ST Sport 2+2 when I drive. I ran the test to disconnect the red wire at the regulator and short to ground to check the voltage and it will barely creep up to just under 13 volts. I find continuity between DF on the start/gen to ground when the switch is off. Also, I removed the wire on DF and the terminal shows it grounded to the start/gen case. Does this mean I need a new starter/generator?