Recently had Alpine 9833 + JLA E6450 amp + BA speakers installed in 2002 Cadillac Seville SLS. With factory antenna module not powered, I have no AM, but good FM. When powered got AM, but FM crackled (very annoying). Installer now has installed two electronic antennas on each side of the top front wind shield, with cables coming down door posts to head unit, unhooked the factory antenna and now I have clear FM but the AM has an extreem bubbling electronic noise above 600 mhz that is definately electronic noise.
They say Alpine says they don't build their units for AM and have no suggestions for resolution. I am using an Alpine installer that is/was reputable, but this seems beyond him and anyone they have contact with, including Alpine! Any ideas would help.