CVO 1/5/2013Purpose. The alternator generates direct current for recharging the battery and for powering vehicle electrical loads.
A 12 volts device was shorted and created it a conflict to the alternator charging output. Do a process of elimination by unplug any 12 volts devices one by one and check the alternator output.
A 12 volts device could be the starter relay or the starter itself etc................
See this post to have the idea.