Low Charging Voltage

thanks for all your help folks. problem fixed ! turned out to be my moroso battery switch i have located by my tail light. it was the terminal in which the wire runs to my alternator. i had noticed that the wire was loose a week ago so i just tightened it up. but once i finally ran out of idea's i disconnected the wire off the battery terminal on the alternator that runs to the switch and connected the orginal wire in the harness back up to it and bang. 13.5 volts. i tried a jumper wire hopping it was the wire and not the switch but same bad results.
terry