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thanx for you quick replies. The VGA cable I am using is a heavy duty one. Shielded and ferrite beads on each ends. Interference of an electronic object near the vga cabe is unlikely as when the car is off also there is no interference in the screen or speakers. If I disconnect everything and just leave the amp plugged in with no input I still suffer from alternator whine. obviously there is some interference comming from the alternator or the engine or something as it only happens as I said when the car is on. The flicker is more like wavy horizontal lines which scroll down the screen.
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