Hi All
Had similar problem when dual battery installed. Fuel gauges would under read and then move back up so really had no accurate idea how much fuel left.
The under tray 2nd battery was only earthed to tray mounting point, so when Battery World up here in the Bay recently installed solar panel and regulator, they ran another earth wire from 2nd battery back to same point on the block where main battery was earthed.
Problem solved.
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