1999-2000 Ford Windstar The battery light is on, but the alternator is charging Has a code P1246

By | January 18, 2014

Download Direct-Hit 2000 Ford Windstar 3.8L Test Details Hotline Archive # 124501 Confirmed Fix Vehicle Application: 1999 Ford Windstar 3.8L, Vin 4 2003 Ford Windstar 3.8L 2000 Ford Windstar 3.8L, Vin 4 Customer Concern: The battery light is on, but the alternator is charging. Has a code P1246. Tests/Procedures: 1. Disconnect the alternator and the Powertrain Control Module (PCM). Check the Violet (VT) (GENerator MONitor or GENMON) wire from the alternator to pin 20 of the PCM connector and the Red/Pink (RD/PK) (GENerator COMmand or GENCOM) wire from the alternator to pin 45 of the PCM for high resistance, an open, or a short to ground. Repair the wiring as needed. 2. If the wiring checks OK, reconnect the PCM and alternator. Start the engine and monitor the VT wire for a roughly 0-10v square wave signal. The signal will be around 40-50% normally with no loads on the system and minimal charging system output. As the load increases, the duty cycle should increase (NOTE: the duty cycle is a positive duty cycle so as the duty cycle increases, the voltage high time increases). 3. If there is no signal on the wire, disconnect the alternator and with key on check the VT wire for roughly 9-10v from the PCM. If OK, jump the Orange/Light Blue (OG/LB) wire to battery voltage and recheck operation with everything connected. This wire should be battery voltage at all time. If the OG/LB wire has battery voltage, the VT wire shows voltage from the PCM but there is no signal on it with the alternator charging, suspect a faulty, defective or incorrect alternator. Potential Causes: Alternator Harness Diagnostic Codes: P1246 Author: Bob Mordorski Average Reported Mileage: 111356 Confirmed Fix Summary Confirmed Fix 21 – Alternator 1 – Alternator Wiring Confirmed Fix Details Tech Reported Fix Details Confirmed Fix Jerry Katt October 16, 2009 2000 Ford Windstar, 3.8L, Vin 4 Replaced Alternator — The first replacement alternator was not the correct one. A second replacement alternator was needed to correct the problem. 118,000 miles Alternator John Haney November 09, 2009 2000 Ford Windstar, 3.8L, Vin 4 Replaced Alternator — The alternator had to be replaced several times before getting an alternator that worked correctly. 14,284 miles Alternator Tim Burkholder February 18, 2010 2000 Ford Windstar, 3.8L, Vin 4 Replaced Alternator — Installed new OE alternator and it’s fixed. 208,559 miles Alternator Ray Andresen February 08, 1999 Ford Windstar, 3.8L, Vin 4 * Replaced Alternator Alternator

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