Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1987CUTAWAY 6.9 1REPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCRUISE CONTROL SYSTEMSTESTINGBRAKE LIGHT SWITCH TEST
1987 Ford Cutaway 6.9 1
Brake Light Switch Test
1987 Ford Cutaway 6.9 1SECTION Brake Light Switch Test
NOTE:
This test should be performed whenever brake application will not disengage speed control system. On vehicles with M/T, ensure that clutch switch is working properly before performing this test.
- Check for stop light operation with a maximum brake pedal effort of 6 lbs. (2.7 kg). Check brake pedal actuation and stop light switch if pedal effort required is excessive.
- If stop lights operate correctly, check battery voltage at 6-way connector Black/Green wire on Vans and White/Purple stripe wire on Bronco and Pickups.
- Depress pedal until stop lights are on, and check voltage at 6-way connector Red/Black wire on "E" series and Lt. Green wire on Bronco and "F" series Pickups. If voltage readings differ by more than 1.5 volts, high resistance exists in stop light circuit and must be corrected.
- If stop lights do not work, check stop light switch, supply circuit, fuses and bulbs for correct operation.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.