Having problems with your 1988 Mazda RX-7 ?
RX-7 1988 does not have brake lights and blinkers do not work although you can hear the blinker under the dash.
Your Boo switch is open. Look for the brake pedal pivoting point, which is going to be almost under the dash board. The Boo switch is attached to the pedal, you should be able to see the plug and wires going to it. Disconnect the plug and remove the switch from the pedal assembly. Replace it. That should take care of both problems.
Repair Help & Product Troubleshooting for 1988 Mazda RX-7
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