Cluster LCD pulsing

[Stingray1967]

Paul, wow. THANKS!! One more thing to add. I had to replace my antenna on the radio a few months ago because the old one wouldn't go all the way down anymore. Yes I tried the ribbon cable only first, and that didn't work, so I bought the whole unit. I did that buy purchasing a replacement antenna from Mirrock. When I put that in, started the car, and turned on the radio, there was a significant buzzing over the speakers. I believe that a ground somewhere got screwed up, but I was VERY careful putting it back together. I haven't spent the time yet to put the rear wheel well out again and check the grounds. The LCD pulsing happens with the radio on or off. When I select the voltage display on the LCD screen, the NUMBER moves around quite a bit. From 13.0 to 14.5. Maybe that's ok, I've never really looked at the voltage this closely. The analog gauge needle doesn't move an inch. And the pulsing is not related to the turn signal or stepping on the brakes, or any other "driver input" electrical load I can think of.