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No Charging / Low Voltage - Defective Rebuilt Alternator Replacement

ElectricalintermediateOP Confirmed
Problem

Vehicle was not charging properly. The original alternator had failed, and a rebuilt replacement alternator was also defective, resulting in continued charging system failure.

Battery not chargingLow voltage / no voltage increase after starting (should read ~14V with engine running vs ~12.7V at rest)Multiple alternators testing as bad
Root Cause

Both the original alternator and the first rebuilt (remanufactured) replacement alternator were defective. Rebuilt alternators, particularly budget brands, can be dead on arrival. The alternator was not producing adequate output to charge the battery.

Confidence

Moderate confidence — Original poster confirmed this resolved the issue

View Original ThreadPosted August 2024 on SupraForums.com