Interference through headunit Please Help!!!
I have a really strange problem thats been doing my nut for about a week now!
Really need some help from the experts on this one.
I have fitted a new headunit, which is a motorised tft screen - It works perfectly apart from when the engine is running then i get constant ticking followed by a whining that get's higher in pitch as i rev.
I can't try a ground loop isolator with the indash screen i'm using at the moment as it connects directly to the ISO block like a normal headunit.
I did try one with the amp and it was slightly better but still there.
I'm totally confused as to how its happening this is the situation to where i am at the moment:-
Alpine CD Player - Removed (worked perfectly even with engine on)
4ch Amplifier and In dash Screen - Removed (ticked and whined when engine on, thought it was a faulty amp/screen)
Different In dash Screen with built in amp - Fitted (Same ticking and whining experienced with standalone amp)
I have tried:-
Earthing in dash screen to body instead of ISO block (no difference)
Powering direct from battery while earthed to body (ticking quieter - whine still there)
Halfords in line power interference suppressor (no difference)
Fitted Halfords alternator noise suppressor on to the alternator (no difference)
I don't understand why its doing it :confused: - the alpine works fine as I've retested it. But the seperate amplifier and the indash screen both pick up interference!
Please can a knowledgable bod help me before I tear ALL of my hair out!! :tard: