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Builtingarage posted a topic in Link G2 G3Hi all Have current side project involving older LEM g3 ecu which ive had upgrade to g4 firmware I have dissected the old wiring loom and noticed all 5v sensor grounds seem to be connected to which looks like 'on the face of it' ecu ground (black wire) pin 26 as seen in attached jpeg can someone please confirm on this? following the LEM pinout it seems there isn't a 'dedicated' sensor ground pin as such? thus am guessing when I buld new wiring harness im ok to treat pin 26 as my sensor ground Also can simon/someone confirm here on the an volt changes as seen here in attached image when receiving the ecu back arefter the g4 update