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I had a similar buzzing issue years ago and Yendor pointed in in the right direction. Not sure if yours and &Mudski issue is the same as mine but have a look at what was causing mine. http://www.nissanpatrol.com.au/forum...ighlight=Relay
The buzzing in mine is from under the bonnet. I'm not bothered by it to be honest. Its been doing it for years. I'll look at fixing it one day. Maybe.