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I'm having problems with alternator noise a whine it got a lot quieter when I touch the metal on antenna plug to RCA port on heade unit I've checked my grounds idk what's happened it was workin me n some friends went camping then itStarted whinin maybe something came loose I thought but I seen nothing help appreciated

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Have a DMM?

Check the resistance between the HU chassis and the RCA outside conductor.

If it isn't close to zero you may have lost your RCA ground reference (pico fuse).

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2004 BMW M3
Mechman 280A
2 - XS Power XP3000

1 - XS Power D375

500F of Maxwell SuperCaps (soon to be 1000F)
iPadMini2

Dash mounted O-scope
Audison bitOne (Remote DRC MP)
Highs Amp - PPI Art A404
Hertz HSK130 (HSK165 waiting...)
DC Audio DC9.0K
2- DC Audio XL12m2

LEGAL             - 147.3dB @ 41Hz
OUTLAW         - 150.2dB @ 45Hz

OUTLAW         - 145.7dB @ 30Hz
JUNE 2014 SOTM WINNER

2014 COLORADO PEOPLE'S CHOICE WINNER

SOTM BUILD:
http://www.stevemeadedesigns.com/board/topic/141656-wicks-e46-m3-build-bass-turbo-button-and-a-big-new-addition/page-68#entry2802026

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Check the continuity between the HU chassis and the outside conductors of the HU RCA connectors (nothing connected to the HU).

If you lost that connection then it could introduce noise into your system which is why it may have gotten better when you grounded them out with your antenna plug.

New RCA cables won't help, you need that connection fixed in your HU or you could do the trick where you wrap bare wire around the RCA outside conductors and then run that wire to a short ground connection (HU chassis).

This post sent with 100% recycled electrons.
2004 BMW M3
Mechman 280A
2 - XS Power XP3000

1 - XS Power D375

500F of Maxwell SuperCaps (soon to be 1000F)
iPadMini2

Dash mounted O-scope
Audison bitOne (Remote DRC MP)
Highs Amp - PPI Art A404
Hertz HSK130 (HSK165 waiting...)
DC Audio DC9.0K
2- DC Audio XL12m2

LEGAL             - 147.3dB @ 41Hz
OUTLAW         - 150.2dB @ 45Hz

OUTLAW         - 145.7dB @ 30Hz
JUNE 2014 SOTM WINNER

2014 COLORADO PEOPLE'S CHOICE WINNER

SOTM BUILD:
http://www.stevemeadedesigns.com/board/topic/141656-wicks-e46-m3-build-bass-turbo-button-and-a-big-new-addition/page-68#entry2802026

sig-sized6_zps0265e669.png

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