Well thought we had it licked.. unplugged inverter started engine fuel gauge registered, and then fell back down..
The receptacle outside is a gfi but it had lost it's ground checked further and found the ground was tied in with the nuetral....older home so now i check rest of outlets they too are same way now to work on house grounding too. The fun never ends around here.
chked ground going to back of dash which has a main ground wire it was good, but I know there is an intermittent break in it somewhere in the circuit maybe the metal strips on the circuit board.
it's gotta warm up outside before anything else !!
anymore suggestions are WELLCOMED..