Help, my 2008 Alfa Romeo 159 Jtd has odd light behaviours (all the light in my car include cabin…

Help, my 2008 Alfa Romeo 159 Jtd has odd light behaviours (all the light in my car include cabin light, head light tail light etc darkens and brightens continuously with a sound). I think it's the alternator, what do you think?

often it is, but find a place like auto zone where they load test batteries and alternators free . It could be either, both, or a wiring short causing all that.

false