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Hi Mike,
sorry for the delay (I work away a lot).
The smoothing cap (or supressor as it is known in the auto world) should be fixed to the live input on the stereo...the problem you have got is that your stereo must be powered from the incorrect place...so you will rather have to rewire or trace the wireing back to its supply and fix the supressor there.
Halfords or any auto parts place in the UK sell these for a couple of £'s
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