I know there have been postings on this but I couldn't find and answers.

Generally the Crossfire ICE is quiet but the other day I had my PDA with GPS plugged into the lighter to charge with the engine off, but aux and radio on a FM station. There was a clearly audible "white" static type noise. Tried the CD and the same, unplugged the PDA from the charger lead, all quite.

Any ideas?

Malcolm