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Changed alternator after a days use the battery's drained down stared loss GPS tack radio then went dead towed home charged battery's cranked it output from alternator output was was 8 volts strait from the alternator and it was a new one could it be something else other than a bad new alternator thanks gregHonda 225 2009 not charging replaced alternator only charging 8 volts battery light and engine light not on on the control panel any help thanks