When I try to selectively make translucent (SetObjectDislpayMode = Ghosted) thin outer sheet metal cladding I want to see solid objects through, even though edges and tangent seams are set to display as black in both solid and ghosted modes, and they indeed show in ghosted mode just fine (with the kludge of usually turning on Print Preview so they really show up at all zoom factors), ghosted mode objects are not letting edge lines through for display in either view or in printouts.
Oddly enough, setting inside objects also to ghosted mode restores edge display, but that’s not what I need to show those objects clearly as real solids.