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It's a matter of degree

Switchers like those create high levels of noise that travel onto both the input and the output wiring. The input wiring is of particular concern because this path connects to other devices in the car. In addition, the input wiring can act like an transmitting antenna for the noise, and it's difficult to filter because of the DC current involved. As Tre' noted, you'll also have to deal with noise radiated directly from the device. Mu metal shielding sounds good in theory, but the supply can't be entirely enclosed due to the need for ventilation. In the end, the noise can be reduced somewhat, but not eliminated. This is why I recommended a temporary installation first, with no permanent mounting until you're sure there are no ill effects.









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