power to 3 way sw but rear tires will not center
try it with all the wheels off the ground , then check the proximity switches on the axle , leaking rams etc
Myles If the rear wont lock out suspect front proximity switch for damage on the blue face or bad wiring on the plug on the switch also see if the gap is correct can always test switch with a spanner flashed under the switch and it should lock out the hyd valve