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If you read my post above Pete's you'll see that I've also been struggling with the problem. My best advise to you is to make certain that it's the box before you spend the big bucks. Because of the small voltages, the system is sensitive to the aging effects of corrosion and wear on the connectors, resulting in increased impedance and erratic readings. It would not be inaccurate to say that I've kind of given up on the problem, and I now get good readings if it's mostly full and erratic ones under 1/2 full. So I never take off without climbing on the wings and doing a visual check.
Ernie
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