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 MANUALSFORD1987AEROSTAR VAN PASSENGER, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALCHARGING SYSTEMSALTERNATOR - MODELS W/INTEGRAL REGULATORBENCH TESTINGRECTIFIER TEST
1987 Ford Aerostar Van Passenger, Standard
Rectifier Test
1987 Ford Aerostar Van Passenger, StandardSECTION Rectifier Test
- Remove rectifier from alternator. Adjust ohmmeter to x1 scale. Place one lead on one of rectifier "BAT" blade terminals. Place other lead on each of the 3 stator terminals. See Fig 1 . Reverse leads and repeat test. Note readings in both directions.
- Reading of approximately 7 ohms in one direction and no reading with leads reversed should be obtained.
- Place one lead on rectifier base plate and remaining lead on each of the 3 stator terminals. This is done to test negative diodes. Reverse leads and repeat test.
- Reading of approximately 7 ohms in one direction and no reading with leads reversed should be obtained. If readings are not correct, replace rectifier.
RENDER: 1.0x
NO RELATED
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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.