09 Dodge Caliber elec issue

Hey, technically it’s a mopar. My daughters got a 09 Dodge Caliber. About 6 months ago replaced alternator, old one was spitting pieces. Recently she told me batt lights coming on intermittently. Battery was marginal so I replaced that. Batt light still comes on intermittently. Reads Batt voltage when light is on. I discovered doing the “key cycle” (key on, off, on,off, on, off) then start the light goes off, voltage normal. Voltage is controlled by pcim from what I’m reading. Any way to check that or anyplace else I should look?