Yesterday I switched into 4WD, to drive out of my yard is all sand and need 4WD to get out, when I switched it over the little indicator light was yellow, has it always been yellow? If not why is it yellow? I thought it was green. Am I losing it? It seemed to work fine.

 

You are indeed crazy. It's not green, though I wouldn't call it yellow. More of an "amber" color.

 

Yup. Amber (for lack of a more refined knowledge of the spectrum).