Audio Help Needed

[rvbuilder2002]

Pin 6 on the fuselage connector is the control line input from the stall switch in the wing. Any time it switches to ground, the stall warning activates.

You can confirm whether you are actually hearing the stall warning tone, by adjusting the stall volume pot clockwise and listening for a volume change.

If you confirm it is the stall warning you are hearing, ou should be able to functional test the stall warning system with the fuselage D-sub connector removed from the AV-50000 box. If the tone is gone with the connector removed, then at some point in the fuselage the control wire is incorrectly connected to ground (the stall warning is activated by the wire on pin 6 being switched to ground by the stall switch). If the stall tone is then still present with the fuselage connector removed, it might be a problem in the AV-50000 box.

[D&M Dan]

Thought I would report back what was found to be causing the loud stall warner tone in the audio system. After bypassing the com radio from the AV5000, as Joe suggested, the radio worked properly with no tone. I was working with Sterling at Van's by email and he suggested I return the unit for testing.
Scott Mc Daniels I believe tested the unit and found a failed MOSFET in the stall warner circuit.
I have reinstalled the unit and as suggested ran a dedicated ground wire from the headphone jacks back to the intercom ground.
Fired it up and with a little adjusting of the volume and squelch things seem to be working as advertised.
Thanks to all here and at Van's for the assistance. Off to the airport finally.