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![]() | Home > In Car Electronics > Ground Loop Fix |
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Chuckalicious Member Since: 23 May 2014 Location: Midlothian Posts: 1796 ![]() ![]() |
Hey all,
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IanMetro Member Since: 11 Sep 2017 Location: Somerset BS21 Posts: 3211 ![]() ![]() ![]() |
The use of an inductive load (isolator) in the lead connecting the units only addresses the symptoms.
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Chuckalicious Member Since: 23 May 2014 Location: Midlothian Posts: 1796 ![]() ![]() |
Thanks, that was really useful. The isolator has certainly dampened the audio, that’s the only way I can describe it.
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IanMetro Member Since: 11 Sep 2017 Location: Somerset BS21 Posts: 3211 ![]() ![]() ![]() |
From what I can see The Aux In feeds to the Integrated Audio Module with a twisted pair (L+R) and its own signal earth.
The Int Audio Module is fed from the Rear Fuse Box FD02 (although the Fuse Box Info below marks it as FD01?? If you are going to piggy back a fuse I suggest this is the place to start. As long as the existing car earth connections are clean and good then I would think that no additional earth is needed, just pick up your power earth from the same fuse box.
![]() Link to Fuse Box Info https://fuse-box.info/land-rover/land-rove...2014-fuses As I have no details of how the modules work I cannot go deeper than first principles. FL2 XS SD4 Auto 2010 2012-2017 (21k - 91k miles) (MY2011) FL2 Metropolis SD4 Auto 2014 2017- (16k - 79k+ miles) (MY2015) Metro in its 11th Year of (Extended) LR Warranty / Full LR Service History (Expensive, but Trouble/Worry free - hopefully?) |
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Chuckalicious Member Since: 23 May 2014 Location: Midlothian Posts: 1796 ![]() ![]() |
That is amazingly helpful. Thank you. FL2 TD4 GS 60 reg Facelift - so many issues
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Chuckalicious Member Since: 23 May 2014 Location: Midlothian Posts: 1796 ![]() ![]() |
Interesting! I’ll look under the carpet when I get home. It’s 10 years old, chances are it’s corroded or something.
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IanMetro Member Since: 11 Sep 2017 Location: Somerset BS21 Posts: 3211 ![]() ![]() ![]() |
Thanks for investigating further. It would seem that we need to find a common power and earth for both units, as you seem to rule out electromagnet interference.
This Diagram shows the power to the sockets, although 12v power is from same source the front and centre sockets are grounded at G3D127-1, and the rear at G4D149-1
FL2 Metropolis SD4 Auto 2014 2017- (16k - 79k+ miles) (MY2015) Metro in its 11th Year of (Extended) LR Warranty / Full LR Service History (Expensive, but Trouble/Worry free - hopefully?) |
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Chuckalicious Member Since: 23 May 2014 Location: Midlothian Posts: 1796 ![]() ![]() |
So a little update with more detail. I set the CarPlay unit up as normal, but instead of plugging the unit into the aux port, I plugged a set of headphones in and there was no noise/interference at all. So the unit itself isn’t making the noise, it’s only when it is looped into the aux. Which I *think* confirms the whole ground loop thing. FL2 TD4 GS 60 reg Facelift - so many issues
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Chuckalicious Member Since: 23 May 2014 Location: Midlothian Posts: 1796 ![]() ![]() |
A further update. With the unit plugged into the power socket and running, I am getting DAB interference when I try and listen to the radio. Unplug the power and the signal is perfect.
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IanMetro Member Since: 11 Sep 2017 Location: Somerset BS21 Posts: 3211 ![]() ![]() ![]() |
As the interference is altered by RPM, then I think that it is possibly an AC ripple is getting through to the DC supply. If it is then I doubt if any in-line filter will be sufficient.
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Chuckalicious Member Since: 23 May 2014 Location: Midlothian Posts: 1796 ![]() ![]() |
This seems to becoming quite complicated |
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Chuckalicious Member Since: 23 May 2014 Location: Midlothian Posts: 1796 ![]() ![]() |
Just a little update to this. I have just hardwired the unit into the passenger footwell fusebox, earthed to the bolts in that area and the noise is still there. FL2 TD4 GS 60 reg Facelift - so many issues
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IanMetro Member Since: 11 Sep 2017 Location: Somerset BS21 Posts: 3211 ![]() ![]() ![]() |
I am running out of ideas.
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Chuckalicious Member Since: 23 May 2014 Location: Midlothian Posts: 1796 ![]() ![]() |
Don’t apologise Ian! You and everyone else have been exceptionally helpful. It could well be the more complex things you suggested that could be the problem - I haven’t yet looked into those. I was hopeful that in hardwiring it in, which I was always going to do, would help solve the issue.
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