I put at least 3 alternators in my Chevy 2500. I like having a volt meter so you see can a problem coming. Harry, I could not find an idiot light on start up bulb check. Couldn't find anything in the menu either. I ended up buying a cig socket one on amazon. I like it, I plug into the lower socket, only use it when plowing.
https://www.amazon.com/gp/product/B000EVWDU0/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1