I read some threads re the bulb fault indicator. Mine is on also. I believe it is the rear window brake light and the right rear side marker. I tried non dealer bulb in the side marker and it won't light. I then took the left bulb and installed it on the right and it stiill won't work. I then ran a volt test and I get 4.6 volts on the right rear and 8 volts on the left. What gives?