JoeyF1722

Thanks everyone for the help, I removed the alternator and had it tested and it was bad. was it a coincidence I don't know, installed a new one and everything works like it should including the plow.

I'll get that info for you later today when I get home, thanks

The only part of the plow harness connected to the truck at the momnet is the light harness everything else is disconnected and it still doesnt charge

It does not have the VYU plow prep I hooked the power and ground to the passenger battery. haven't hooked up the small wire to the fuse box yet I did not install the GM plow load harness? wasn't provided one from the dealer, should I have been?

I forgot to mention that I did check the cable coming from the alternator for power while it was running and I was only getting 12.8V, I checked the plug on the alternator as well and it was good. looks like the ECU is not telling the alternator generate power, would it be possible that the ECU is latched up?

Thanks for the info Scott, I'll do a drop test latter today

Yesterday I installed a fisher plow harness into my 2020 GMC Sierra 2500HD, had to remove the passenger side battery to run the remote wire through the fire wall, once that was done, I reinstalled the battery and installed the power and ground wires form the plow harness. Now my battery light is on and is not charging. I double checked all the connections and checked all the fuses. I Ohm'd out the cable from the alternator to the fuse block on top of the battery and that that was good. I hooked up my scanner and there are no codes besides the one's from disconnecting the MAF sensor (which I have cleared) I'm at a loss has anyone come across this before? Any help would be great thanks!