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Home >> Ford >> 2002 >> Taurus SES, 3.0 S >> Repair and Diagnosis >> External Pages >> Different car >> Section 255 (Generators & Regulators -- F250-F550 Super Duty (Diesel With Dual Generators)) >> System Tests >> Test E: Batteries Are Dead Or Will Not Stay Charged

Test E: Batteries Are Dead Or Will Not Stay Charged

WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

  1. Check The Fault Codes In The PCM

    Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Turn ignition switch to RUN position. Using NGS tester, perform Powertrain Control Module (PCM) self-test. If no DTCs exist, go to next step. If any DTCs exist, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  under SELF-DIAGNOSTIC SYSTEM.

  2. Check The Battery Condition

    Turn ignition off. Disconnect NGS tester. Test condition of batteries. See BATTERY TEST WITH DIGITAL BATTERY ANALYZER  under ON-VEHICLE TESTING. If both batteries are okay, go to next step. If either battery is defective, replace appropriate battery.

  3. Check The Battery Drain

    Perform BATTERY DRAIN TEST  under ON-VEHICLE TESTING. If no excessive current draw was not found, go to next step. If any excessive current draw was found, repair as necessary.

  4. Check The Upper Generator Output

    Disconnect lower generator 3-pin connector. Perform load and no-load tests on upper generator. See GENERATOR LOAD TEST  and GENERATOR NO-LOAD TEST  under ON-VEHICLE TESTING. If upper generator is okay, go to next step. If upper generator is not okay, replace upper generator.

  5. Check The Lower Generator Output

    Connect lower generator harness connector. Disconnect upper generator 3-pin connector. Perform load and no-load tests on lower generator. See GENERATOR LOAD TEST  and GENERATOR NO-LOAD TEST  under ON-VEHICLE TESTING. If lower generator is okay, go to next step. If lower generator is not okay, replace lower generator.

  6. Check The Other Systems For Drains

    Perform BATTERY DRAINS THAT SHUT OFF WHEN BATTERY CABLE IS DISCONNECTED TEST  under ON-VEHICLE TESTING. If there are any current drains that shut off when the batteries are disconnected, repair as necessary. If no drains were found, replace batteries as necessary.
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