Quote: You realize that the head light circuit is the same high or low for both ground and up to the dimmer switch. Only the supplied voltage changes between high or low, so ground should be ok if the lows work. the floor mounted dimmer or the wiring to the lights is your issue.
OK so if I follow what your saying since the low works the third wire (ground) at the headlights is good
Then when you tap the dimmer I see with a meter the power come off the wire that lit the low beam and the wire to the other filament is hot but the high filament doesn't come on so the dimmer switch is the culprit because both of those wires should have stayed hot???
The dimmer is new but that doesn't mean much nowadays.
