Brake light - triggered by voltage spike?

[universeman]

Team,

My brake warning light in my SC used to stay on all the time. I repaired the spring switch in the handbrake lever, and it was fixed for a while. But then it came back on once while driving. I reset it with the battery-disconnect method, however it would intermittently come back on, usually after some heavy acceleration during driving (tough b/c I didn't always notice it right away.)

I've read/heard somewhere that it is also intended to indicate alternator/VR problems - double duty with brake warning.

I've replaced both brake switches (but not the master cylinder.)

Is the alternator warning light thing true? There is a separate warning/battery light for alternator, but it stays off.

[Bob Kontak]

My 81 brake light is working normally. Key on, brake light on. Start car, light goes off. Two clicks on the hand brake, light on.

I disconnected the battery positive while running for grins. Seat belt warning light flickers but not brake light.

How hard is it to isolate the e-brake switch from the circuit? Maybe that would be a step you could take. Appears the switch just creates ground when engaged.