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 MANUALSFORD1990RANGER 4WD L4-140 2.3L SOHCREPAIR AND DIAGNOSISCRUISE CONTROLBRAKE SWITCH (CRUISE CONTROL)TESTING AND INSPECTION
1990 Ford Ranger 4WD L4-140 2.3L SOHC
Brake Switch (Cruise Control): Testing and Inspection
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION Testing and Inspection
Perform this test only when brake application will not disconnect the speed control system.
1. Check operation of stop lamps by applying approximately 6 lbs. of pressure to brake pedal. If more than 6 lbs. is required, check brake pedal actuation and stop lamp switch.
2. If stop lamps do not function properly, check bulbs, circuit fuse or stop lamp switch.
3. If stop lamps function properly, check for battery voltage at 6-way connector using white wire w/purple stripe.
4. Depress brake pedal until stop lamps are illuminated. Check voltage at red wire w/black stripe on E-Series models, or the light green wire on Bronco and F-Series and Ranger, Bronco II, Explorer and Aerostar. The difference between the two voltage readings must not exceed 1.5 volts. If voltage is greater, a high resistance exists in the circuit and must be and corrected.
1. Check operation of stop lamps by applying approximately 6 lbs. of pressure to brake pedal. If more than 6 lbs. is required, check brake pedal actuation and stop lamp switch.
2. If stop lamps do not function properly, check bulbs, circuit fuse or stop lamp switch.
3. If stop lamps function properly, check for battery voltage at 6-way connector using white wire w/purple stripe.
4. Depress brake pedal until stop lamps are illuminated. Check voltage at red wire w/black stripe on E-Series models, or the light green wire on Bronco and F-Series and Ranger, Bronco II, Explorer and Aerostar. The difference between the two voltage readings must not exceed 1.5 volts. If voltage is greater, a high resistance exists in the circuit and must be and corrected.
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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.