Good catch, DrewE
https://bsintek.basco.com/BriggsDocumentDisplay/default.aspx?filename=ngjpyNY.p9ZVj5K1wPage 22 of that has the wiring diagram, where it seems the ground for the receptacle goes to GT and so does what could well be the chassis ground.
EDIT--the thing also to GT in that diagram appears to be the paralleling connection, which has three pins to it. You see the plugs on the two cords from the kit here--they are sort of triangular and go in the same shaped receptacle on the gen.( I looked at mine under its cover flap--three holes for prongs) I do not have a wiring diagram for the kit.
So it seems one of the kit three prongs goes to GT
https://www.briggsandstratton.ca/na/en_ca/product-catalog/portable-generators/inverter-parallel-kit.htmlGlad we got that cleared up! Gads!
