A little help. 1989 M998 6.2 3 speed. While sitting in garage in neutral, brake lights work. So all this time I think I am good during my pre-drive check LOL. But while driving down the road the brake lights do not work? ALL other lights work, except blackout which I do not have any bulbs, but don't think that would matter. Any ideas why brake lights work sitting in garage in Neutral, but not going down the road?