u/Decent-Apricot-3852

Quick question for anyone that might have encountered this or any ideas why?

I replaced my auxiliary battery aboutn6 months ago. Today a warning light popped "auxiliary battery malfunction"

Can't possibly be the battery, right? Fuse maybe?

I have a carbon fiber spoiler on my AMG C series. I live in Minnesota so the winters are rough. It is fading a bit and needs to be replaced. Could anyone suggest a good reputable place/website to get a new one? I see a million on Google and blah blah. All with terrible reviews. Prefer not to use the MB option either as it's obnoxiously expensive.

Thanks in advance.