2007 Dodge Ram 4 Wheel Drive Diagnose & Repair

Running down why my 4 wheel drive wouldn't engage.
Raised the truck so the tires were off the ground to see which driveshafts were turning in 4 wheel drive and in 2 wheel drive. Found that the actuator at the transfer case was working properly. Tracked it down to the front actuator. Removed and bench tested the actuator. Found it wasn't working. Bought a new one and installed it.