Problem found!
Well my problem is solved. There's a short 20" long pigtail wire that goes from the truck frame to the rear end that plugs into the ABS sensor. The little prongs on the end of the pigtail on the sensor end had pulled out and were not making contact inside the pigtail. $27 fixed it, after spending $67 on an unneeded sensor.
Thanks for everyone's help!
Well my problem is solved. There's a short 20" long pigtail wire that goes from the truck frame to the rear end that plugs into the ABS sensor. The little prongs on the end of the pigtail on the sensor end had pulled out and were not making contact inside the pigtail. $27 fixed it, after spending $67 on an unneeded sensor.
Thanks for everyone's help!