I have a ignition noise problem with a Bose noise cancelling headset. - When i touch the metal throttle spindle, I get noise in the headphones.

The McFarlane throttle has a central wire in a teflon sheath. Its connected to the throttle lever on the throttle body.


Multimeter checks this morning indicate that the throttle spindle/wire and airbox/ throttle body are not grounded to the airframe. Its suspended by the rubbber connectors to the manifold. My supposition is that enough RF interference is being radiated by the airbox/throttle assembly to upset the headphone electronics if I touch the metal throttle spindle.


Question; is the airbox/throttle body not grounded to the airframe/ engine block by accident or design? if its not an issue, a simple jumper will fix it.

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