LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 2001 >> Taurus SEL >> Repair and Diagnosis >> External Pages >> Different car >> Section 12 (Generators & Regulators) >> System Tests >> Test C: System Overcharges
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test C: System Overcharges

WARNING: This page is about a different car, the 2002 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Turn ignition on. Using NGS tester, perform Powertrain Control Module (PCM) self-test. If no DTCs are retrieved, go to next step. If any Diagnostic Trouble Codes (DTC) are retrieved, perform appropriate test in accordance with DTC retrieved. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  2. Turn ignition off. Disconnect NGS tester. Start engine. With engine running and all accessories turned off, measure voltage between battery terminals while varying engine speed. If voltage is less than 15 volts, go to step  4 . If voltage is greater than 15 volts, go to next step.
  3. Turn ignition off. Disconnect generator 3-pin harness connector. Turn ignition on. Measure voltage between ground and generator harness connector terminal No. 3 (Red wire). See Figure . If voltage is less than .5 volt from battery voltage, go to next step. If voltage is greater than .5 volt from battery voltage, repair high resistance in Red wire. See WIRING DIAGRAMS  .
  4. Turn ignition off. Reconnect generator 3-pin harness connector. Start engine. Check generator output. See GENERATOR LOAD TEST  under ON-VEHICLE TESTING. If generator tests okay, system is operating correctly at this time. If generator does not test okay, replace generator. See GENERATOR  under REMOVAL & INSTALLATION.
scientia non olet · About LEMON Manuals