Truck shuts when moving plow?

[screwatts]

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.

[mustangman02232]

yes, napa alternator, go get a ford one (out of the ambulance package its 140v vs 110v) do you have a volt meter? are you loosing all power when you try to raise or lower it?

[Lilpooh]

Have you checked all your ground connections, especially on the pass side where the neg cable gets bolted to the front of the engine block by the AC compressor.