No power to 4wd switch

4lo flashing constantly
Actuator is working but only able to confirm with tester.
Cannot get actuator to engage with cab switch.
Fuses all good

 

Crank the wheel put it in reverse or drive then let off the brake and move forward or reverse at a slow speed and see if it engages.

 

Already tried. Nothing. There isn’t any power showing at switch with tester

 

I believe the switch (4WD Selector Switch) is just used as a ground to the 4WD ECU.
There for, it shouldn’t have power to it.

 

It's probably a loose wire. Cab switch will not engage or disengage with light flashing as that is an indication the computer doesn't know the status of the actuator. Since it is only 4lo flashing you know it is the transfer case actuator not the one at the front diff. Start by checking all the wiring connections at the actuator, pull them apart and blast some electrical connection cleaner in there then reattach with a gob of dielectric grease.