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Electrical noise

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I am getting on occasions significant inference noise via my radio speakers which goes up and down with engine revs. Strange thing is it’s sometimes there and others not. Any ideas why it would be intermittent with car in same status. I.e. day time driving, no electrical items on or off differently to any other time but sometimes a lot of interference and other times nothing. Thanks 

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I have heard of audio installers that have totally messed up ground connections.

EG, they thought the foil around the engine bay was a proper 'earth'.


I have also heard reports that GOOD installers have run bespoke heavy-=duty ground wiring around to the earth connection in the LH A pillar.

Atwell Haines

'88 Esprit

Succasunna, NJ USA

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