Painful to post update....
So I cut my technic harness (source to MS-8) (couldn't easily access the RCAs) and I have silent bliss...I've been assuming its an installation ground or alternatively a ground loop like kaigoss's...but its not...its coming from UPSTREAM of the MS-8...i.e. the headunit or that area....
Possibilities:
- Power line for my BMW station for apple iphone?
- Damaged ground or something else when I installed the bmw station for apple iphone? (requires repinning sections of the OEM vehicle harness).
- Routed technic harness close to some other power/EMI source?
- defective OEM head unit?
- anyone other ideas?
Where do I start to test cost effectively? Anyone have an OEM hu I can borrow?
Maybe its time for my idrive upgrade.