P0620

tx_oft

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My battery light kept coming on and I noticed the voltage on my mini max dropping from time to time. Brand new batteries in the truck about a month ago so I assumed possibly the alternator. Recently having a stud job done i thought maybe a lose wire. Sure enough, the positive to the alternator was loose and had nearly arched the stub in two. Picked up a new alternator and installed it today. Now I have P0620 that won't go away. I've cleared it numerous times and it pops back up within a minute. Voltage reads 12.0-12.5 on my mini before cranking. After cranking it reads 13.3 all the time. I looked for loose connections, and blown fuses and had no luck. Any suggestions would be greatly appreciated.
 

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