OEM solar panel on motorhome

This question pertains to the small solar panel that most motorhomes are equipped with from the factory.

I noticed this past weekend that the little red light on the dash that indicates the solar charger is working wasn't lit.

I checked the fuse and it is okay. This isn't something that I rely on, or consider a big deal, but I do like to keep all systems in working order.

Can anyone describe what I should check, and how to check it? I'm a neophyte when it comes to electricity.

Thanks!