If it's just when it's been sitting for a period of time, and only after you've started the engine, my first thought would be a house battery isolation relay going bad.
I had a similar issue with mine, as the coil in the relay got weak it would flutter open and closed for a bit when first started.
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Ted 'n' Laurie, plus Jackson (aka Deputy Dog, the Parson Russell Terrier 'fur kid') and, Rylie (who crossed the Rainbow Bridge June 14, 2012).
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