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 MANUALSFORD1991PROBE GL, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALCHARGING SYSTEMSALTERNATOR - 2.2L MODELSTESTINGRECTIFIER TESTING
1991 Ford Probe GL, Standard
Rectifier Testing
1991 Ford Probe GL, StandardSECTION Rectifier Testing
NOTE:
To perform the following test, disassembly of the alternator is required. The rectifier assembly must be disconnected from the stator prior to performing tests to either unit.
- Use ohmmeter to check for continuity between positive diode lead and heat sink on positive diode side. There should be continuity from positive diode lead to heat sink and no continuity in opposite direction. Repeat test for each diode. If meter readings are not as specified, replace rectifier assembly.
- Repeat test for negative diodes. Check for continuity between negative diode lead and heat sink at negative diode side. There should be continuity from diode lead to heat sink and no continuity in opposite direction. Repeat test for each diode. If continuity is not as specified, replace rectifier assembly.
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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.