Hey

I've got a connects 2 adpator for my iPod plugged into my symphony headunit.

I had to connect the earth cable from the connects 2 adapter to a decent ground, so I spliced it into the actual earth cable that runs into the back of the head unit.

My problem is, that with the engine running, and my iPod on (but no music playing), I can rev the car, and I can hear a whining noise through the speakers, that get's louder and more noticeable, the more I tap the accelerator.

It also makes this noise when I'm stationary, with the engine running, putting load on the power steering (Dry steering).

Why is this? Is it a bad Earth? Shall I just run a small feed straight to the battery and ground my iPod adapter to that?

Prob caused by a ground loop.

Try running the ground to a part of the car chassis (bare metal) before going the battery way . Might be a bit easier.

Edited 20 October, 201015 yr by Rhoobarb

Sorry

Forget to mention, I've done this as well, but it's just the sane.

I take it its via an ipod connector not standard 3.5mm jack? And that the ipod gets power from the same connector.

A quick-fix solution would be to fit a ground loop isolator in the audio line somewhere between the ipod and the back of the stereo. If you had a simple 3.5mm jack or standard phono jacks setup its just a case of adding another cable between the two with the isolator in the middle of it (between £5-£10) but if its a ipod connector This could mean hacking at some cables or just a quick clip on job depending on your setup.

Or the long winded approach would be to find the ground loop problem (no easy task).

I would reccomend the ground loop method as its the easiest to do, but that depends on how comfortable you are with possibly having to splice into your cables.

Edited 20 October, 201015 yr by Rhoobarb

Hi

thanks for the reply.

Looking for a ground loop insulator now, but they all seem to be for phono devices?

Is it possible to just buy one, where I splice into my Eath cable and install it there?

The phono connection is just the most standard form of use, hence phono connectors.

Based on the assumption that your changer connection is analogue, not digital...

You could do the following, but it may be risky so please double check anything first before proceeding.

Essentially an analogue changer connection is a few wires containing control/data/timing signal information, etc. Plus the un-amplified left and right audio (line audio)

http://www.octavia-vrs.com/cms/content/mfd2-install-guide

check the pin diagrams at the bottom for a general indication of pins.

or specifically for symphony

http://www.tehnomagazin.com/Auto-radio-car-connector/SKODA-Car-Radio-Wiring-Connector.htm

What I would try is cut the cd audio left, cd audio right and the cd audio ground wires (AF-L, AF-R and COM on symphony HU) on the cable that goes into the HU. wire 2x sets of phono connectors or 2x 3.5mm plugs to it and stick the ground loop isolator in between. This would essentially act as placing the ground loop isolator between the devices. I would say that should work. if it doesnt just connect the phono connector together to go back as it was.

If its a digital connection I would say your out of luck, but I seriously doubt youve got digital.

The only possible problem I can see possibly the connects2 not functioning 100% because your running the common ground through it for all the data not just the audio.

Bear in mind I am no pro on this stuff, more of a 'lets give it a go' electronics type thats tried a lot of projects that would be considered 'bodgit' or pikey and no serious or costly problems yet, but please try at your own risk.

Like I said thats what I would try, and Im happy to try things without too much bother, but I can't guarantee 100% perfection or that it would work at all.

Hope this all helps in some way (even if its just to avoid it )

Disconnect battery, etc, etc.

EDIT: Added Symphony diagram

Edited 21 October, 201015 yr by Rhoobarb