Beeping noise from dash

DangerousDoug1

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I own an Audi A4 T Sport 98 and all has been fine until tonight. I went to get out of the car and after removing the key from the ignition a strange beeping was coming from behind the dash. After much searching it appears to be coming from the low fuel / lights on buzzer and only stops on removing fuse number 15. I fiddled about a bit and when the side lights are on it stops and turn them off it starts again, also if you press the test button. Got a feeling could be a bad earth but where to start, no diagrams ? So until I sort this out I will have to keep on removing the fuse so any help or pointers is much appreciated.

Thanks
Doug