Interference

[cully]

i expect you will get the same noise from the windscreen wiper motor and maybe the cabin fan or even the fuel pump
you might have to fit supressors to each if you have a sensative amp

But why would it suddenly start. Unless the amp is on the blink? Can i not fit a suppressor to the amp?

you need to supress the source of the noise!

you could try fitting ferrite coils to the amp signal wires as they are the ones picking up the interferance

ferite coils being the same thing thats moulded to computer monitor video cables

and grunt ive replyed