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 MANUALSPLYMOUTH1982HORIZON BASE, 2.2L ENG VIN B, STANDARD TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALCHARGING SYSTEMSALTERNATORSBENCH TESTINGRECTIFIER (DIODE) TESTSTEST LAMP METHOD
1982 Plymouth Horizon Base, 2.2L Eng VIN B, Standard Trans
Test Lamp Method
1982 Plymouth Horizon Base, 2.2L Eng VIN B, Standard TransSECTION Test Lamp Method
- Remove nuts from studs on terminal block securing stator windings and positive and negative rectifier straps.
- Test rectifiers with a 12 volt battery and test lamp equipped with a No. 67 bulb. Connect one test lamp lead to positive battery post and other lead to test probe. Attach second probe to battery negative terminal. Measure rectifier continuity with probes touching heat sink and rectifier top strap.
- Now reverse probes. If lamp lights with current flow in one direction only, rectifier is satisfactory. If lamp lights with probes either way, rectifier is shorted. If lamp does not light either way, rectifier is open. Test each rectifier in both assemblies. Replace defective rectifiers. Lamp should light in same direction for all rectifiers of each 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.