A bit new to all this so fogive me if this is basic...

87 420SEL and I just had an Alpine 7895 installed to stock speakers. Worked without a hitch for a few weeks. Now, whenever I use the turn signals I can hear them clicking in the speakers when the head unit is on. Is this a grounding or fuse problem? Any suggestions would be much appreciated. (Besides playing only songs at the same tempo as the turn signals!)

Thanks,

John