1992 Toyota Celica Repair Question
Brakes lights out
Do you have battery voltage at the Defog and ECU-B fuses? If not, check the 100 A fusible Link in fusible link box underhood.
Stop light and taillight uses different fuses and circuit. If you apply battery voltage to the stop fuse and both system works, power from 100 A (ALT fuse) is not getting to the fuse slots or you have a faulty fusebox.
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