Help please, 4x4 light not going off on my '92 tracker

Good evening, I have a 92 tracker and the 4x4 dash light is not going off. The light seems to just stay on , no matter if in 2wd or 4wd.

Please let me know what I can check, as this seems to only be the indicator light, being that switchin from 2 to 4wd is operating just fine.

thanks

John