spunky

Yesterday while driving, my headlights started to flicker like both bulbs had a loose connection. After driving approx. 20 miles I stopped and put the TB into park and the car just died. No warning lights or anything else. Voltage gauge just started to drop and when it reached 9 it stalled. Tried to restart and nothing. Engine turned over but wouldn't start. Left it sit for 3 hours and returned and it started right up. Had a service engine soon light but it went out in the first minute of driving. Return trip home the voltage gauge would fluctuate between 13 and 15. Battery and alternator both are good. Any ideas? Went out this morning and engine started right up but alternater gauge was at 10 than went up to 14 and was not steady just a little above or below 14. Is this normal?