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The stock amp has been completely untouched. I removed the Becker, did the mods to the housing and installed the cage for the AVIC.
I bought an audi\porsche ISO adapter from a local store (I was told this would plug in and enable me to use the stock amp) and hooked them together. The HU powers on fine but there is a whine coming from the speakers. When the car is in motion there is a low clicking noise (like it needs a suppressor) which gets worse the faster I go but at standstill is gone.
I disconnected the blue power lead (that turns the amp on) and the whine goes. Plugging it in and the whine is straight there.
Do I need to mod the ground going to the stock amp? Re-ground it to somewhere else in the trunk?
If so - is it still the thick brown wire?
Thanks for the response Steve.
Paul.
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