Truck shuts when moving plow?
So we had a snow storm here in MD last week. So I decided to pull my plow out of the backyard and put it on the driveway. Once I got it all hooked up and tried to raise it the truck shuts off . This happened 2-3 time raising it and another 2 times lowering it in my driveway. I took my meter and checked voltage at my alternator and was only getting 12.6 volts . I took that alternator to NAPA . They tested it and it failed. I put my new one on today drove it around for 20-30 mins came home , hooked up the plow and the truck shut off again. Anyone have any clue what the problem is? Thanks for reading.