My alternator just died on my 2009 with 90k miles. It gave very little warning before going out. The battery light on the dash came on about 20 mins from home. After a quick google search about what the dash battery light meant, it said it was most likely due to failing alternator. Turned off AC, radio and unplugged usb cables (as recommended by others) and headed straight home.
Was fine for 10 mins until stopped at a light and then all lights lit up on dash. Started to pull over and dash lights began to fade in and out.....then it died right there on the side of the road. Had to have it towed to my house, first time to be stranded in this truck.
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Tow guy tested battery, said it looked good and was most likely the alternator. Got a new Denso alternator ordered and on the way for Mr. AlohaJen to install when it gets here, and I will provide much needed cold beverage support staff duties as needed!
Kind of bummed how little warning was given before it died, but luckily mine went out 10 mins from home. Would suck to be somewhere remote and then stuck there.