16rwells

I have been tracing this down for days now I have no dome light or cargo light all fuses are good I found the wire going to the dome light from inside fused box and found the black wire is hot when the key is on looked at wiring diagram and it shows the black wire should be a ground I can hook a test light up and and touch it to the grey/black wire and it will come on and stays on as long as the key is on any help ? I have changed headlight switches still no luck.