I was driving my 85 764T when the "bad light bulb light" came on to the dash board. I found that the right rear brake light was fried and replaced same. Back in the car (thinking I had fixed the problem) I noticed the warning light still on). When I checked, I discovered that the bulb was always on bright-(both filiments). The left brake light functions properly , going bright when the brake is applied, though the right stays bright. I tried twisting the bulb slightly which resulted in the light going out when I hit the brake light. Any ideas would be appreciated