no 4x4, low light always on

[eric27]

all fluids good, new computer and electric button.....what should i check next? i hear a faint click from the comp in the back when pressing either 4x4 high and low. connectors looked pretty clean by transfer case also.

 

[DeRocha]

Did you already read through the 4x4 troubleshooting guide? Your symptoms point to a shift motor problem.

4x4 not working (91-94)
4x4 High
The 4x4 system can be shifted on the fly into 4x4 high at anytime. If pressing 4x4 fails to activate 4x4 (The dash and button 4x4 lights are off) then you have a failure in the system (Dash button, 4x4 module, Shift motor). If you listen carefully you should be able to hear the relays in the 4x4 module when you press the 4x4 button. If you cannot hear the relays recruit a friend to sit near the module and listen. If the relays make noise it indicates the 4x4 module has received input from the dash button and the problem lies in either the 4x4 computer or the shift motor. The most common problem is a broken stop bumper within the shift motor that allows the geared position sensor to travel outside of its operational range. When this occurs the 4x4 module becomes lost, and will no longer shift the T-Case as it cannot determine the position of the T-case selector shaft. See the Shift motor rebuild thread on how to fix this.