4 Wheel low dash light keeps blinking on & off.

[RCMerrill]

Can here solonoid in transfer case clicking on & off. while in 2 wheel drive. some times it goes into 4 low at light when stoped.

 

[Bob4x4]

You are going to need a scanner capable of reading the fdcm

 

[sag2]

Sometimes high resistance in the 5v circuit would fool the 4wd system into thinking you were requesting a shift. When the light is blinking it is attempting to make a shift. I have seen the A/C pressure transducer (also 5v circuit) cause it also.