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I'm in the possession of an 89 Thunderbird with the 3.8, and it has no brake lights or power going to the brake lights when the pedal is pushed. I also believe it has a bad dimmer switch as when the light fuse is in the corner lights stay on, but while trying to make sense of the wiring, and vacuum trouble shooting book I have I couldn't find an obvious reason why the brake lights don't work. As far as I can see the wiring is fine in the trunk where it all bunches together. If you have any suggestions as to where I should concentrate my efforts I'd be grateful.