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 MANUALSFORD1987BRONCO 4.9 Y, STANDARD, T18REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALSTARTERSTARTER - MOTORCRAFTTESTING (ON-VEHICLE)NO-LOAD TEST
1987 Ford Bronco 4.9 Y, Standard, T18
No-Load Test
1987 Ford Bronco 4.9 Y, Standard, T18SECTION No-Load Test
- With tester and battery connected to starter, operate starter motor and note voltage reading and tachometer reading. See Figure. Disconnect starter from the battery. Turn load control knob until voltage reading is same as when starter is connected.
- Read amperage draw, and if amperage reading is less than specifications, starter has high electrical resistance. If starter RPM is less than specifications, starter has high electrical resistance. If starter RPM is less than specifications, starter has worn bushings or bent armature shaft.
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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.