Hey there, all the lights were working fine in my 1994 4Runner, but now all the sudden there's a problem. When the headlights are off and i hit the brakes, both rear brakelights come on. But when i turn the headlights on and hit the brakes, the rear right lighting turns completely off... but the left one acts fine. It's definitely not the bulb, we took it apart and tested with new bulbs and even the bulb from the left side which we knew worked. Anyone that can help me out with this?

 

any help?