okay so last night on my way home after blowing a coolant hose my lights started flickering and my battery died. i put in a different battery and unplug one headlight and rode home over 60 miles just one headlight and everything else working. i changed alternators this morning.. then i check voltage on my battery after starting car and im only geting 11.8 volts at the battery. i check the b+ cable on top of my alternator im only getting 10 volts there any ideas?