Heck of a time with my truck

[GTS61]

I was driving home this morning from work with my lights on when I noticed that the voltage meter was ready 10, it was over 12 when I left work. I was almost home and the truck started to stall on and off and the lights went dim and the volt meter was almost 0 then my truck quit. My wife had to come and boost me and I still only got a block down the road and the engine quit again so I left it there until I got some sleep. It must be my generator but I don’t know enough about engines. And advise would be greatly appreciated. Thanks Greg
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