When I hit my rear brake pedal (1993 FXR), the brake lamp filament glows just barely at first, then after a minute or so gets to its normal brightness. If I'm riding and not on the brake, it goes back to that state so when I hit the brake, I get no brake light. If I'm on the brake a lot, it stays "energized" (if that's what you wanna call it). The bulb has been changed, the socket cleaned, the leads off of the brake switch cleaned. Not sure how the switch works to deliver voltage to the wiring...does it sounds like a bad switch?