OK so IF the light comes on even with both switches off. Then it seems that someone has worked on the wiring. IF you are comfortable with doing it I will try to draw a diagram of how it should be wired.I ordered mine from gqf, it was only $7. No shipping, but it came snail mail & took 10 days. My interior light comes on as soon as I plug in the unit. I can't turn it off unless I loosen it up.