Over the winter my ranger has been needing jump starts alot due to lack of use. Today I started it, drove it to my sons school and after a little over an hour, it was dead. I mean, dead like dome light wouldnt even come on. I tried jumping it, it finally started after about 15 minutes of trying to jump it. While driving, everything electrical started blinking, cluster lights were going on and off, & the truck was chugging and sounded like it was going to die out. I'm kind of thinking the alternator is shot with everything blinking they way it was. Any other insight would be helpful!