Jun 05 2009
Ford Excursion 4×4 6.0 Diesel keeps eating voltage regulators/alternators
2003 Ford Excursion 4×4 6.0 Diesel keeps eating voltage regulators/alternators. Two brand new batteries charge on the charger and hold a charge. (I do have a 350ma parasitic draw while the truck is “sleeping.”) I even purchased a 200 amper from DB Electrical and installed an additional 0-gauge wire from the alternator to the battery. Checked the two alternator leads and soldered extra wire to relieve stress on the connector. No changes. At idle, the regulator side of the wire shows 11.6V. The batteries are barely charging at 11.88V. at 1K-RPM the battery voltage goes up to ~12.5. At 1.5K-RPM and above I get 13.89V maximum, sustained unless the RPM drops. This is repeatable.
Answer:
Sounds to me like you have a large load occurring with the engine running.Possible glow plugs staying on or FICM not coming out of injector preheat stage.I would suggest getting the load tested while engine running with a shunt type charging system tester and see how many amps are being pulled.If it has over 20 – 30 amp consistent load then you will need to determine what is causing the excessive load.A ford ids scanner will be needed to determine if ficm and gpc is operating normally.
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