Brake Light Switch Test
NOTE:
Perform this test when brake pedal actuation does not disengage speed control system. On vehicles with M/T, ensure that clutch switch is working properly before performing this test.
- Check for stoplight operation with maximum brake pedal effort of 6 lbs. Check brake pedal actuation and stoplight switch if pedal effort required is excessive.
- If stop lights operate correctly, check battery voltage at amplifier 6-way connector Black/Green wire on "E" series and White/Purple wire on Bronco and "F" series.
- Depress pedal until stop lights are on, and check voltage at 6-way connector Red/Black wire on "E" series and Light Green wire on Bronco and "F" series. If voltage readings differ by more than 1.5 volts, high resistance exists in stoplight circuit and must be corrected.
- If stoplights do not work, check stoplight switch, supply circuit, fuses and bulbs for correct operation.