Thanks for the info. I've found the aerial amp assembly and traced the fault to a capacitor on the main PCB. It appears that someone never varnished the board properly and this component has suffered some water ingress at some stage, causing it to corrode. With the engine running the voltage was...
I have a 2005 A3 Sportback fitted with the original Concert II radio. It has recently developed a fault with the radio where it loses the reception every few seconds. I have traced it as far as the aerial connector, which goes short circuit every few seconds, before returning to normal...
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