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BRAKELIGHT Switch Test

NOTE: Perform this test when brake pedal actuation does not disengage speed control system. On vehicles with M/T, ensure clutch switch operates properly before performing this test.
  1. Check for stoplight operation with maximum brake pedal pressure of 6 lbs. (2.7 kg). If stoplights operate correctly, go to step 2). Repair stoplight circuit if necessary.
  2. Measure voltage on circuit No. 296 (White/Purple wire) of amplifier 6-pin connector. While stepping on brake pedal, measure voltage on circuit No. 511A (Light Green wire) on Bronco, Pickup, and 1991 Van, or circuit No. 511B (Light Green wire) on Aerostar, Explorer, and Ranger. If difference between measurements is greater than 1.5 volts, check circuit to find source of high resistance.
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