Random Alternator?

Hi and thanks for this forum!
So I was getting ready to go on a camping trip tomorrow and will be pulling a trailer with my 2006 v8 Tundra with 130,000 miles. Just as I got home from work yesterday there was an odd whine from the engine. When I started it this morning the engine had the whine and the battery light was on. The battery was new in August last year. I researched getting a new 130 amp alternator in town and decided I could pull the old out and put in an after market one and still go camping. (a remanufactured one would have to be ordered) When I went to move the truck the battery light was off and the whine was gone! I turned on the lights, fan, flashers and wipers and still no whine. The voltage readings are:
Idle: 14.02
idle with lights etc: 13.9
engine off: 12.69
Now I'm Hesitating to change the alternator as I know its a nasty job on this truck.
Opinions? Could the noise and light come from a battery that needed charged from a lot of shut downs and starts?
thanks!
Dave

 

Only way to find out is take a chance on a new battery, but from others with the same symptoms in the past their Alternator was the culprit. I’d stay the course on Denso Reman’d versus aftermarket if that needs replacing.