4LO light blinking

Yes, it is locked on low gear this is why the light flashes. Nine times out of ten the problem is the transfer case shift actuator. Here is the wiring diagrams and the location of the unit so you can see how it works. To confirm the issue test of power and ground at the actuator.

This guide can help

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken