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Battery Dash light on? Battery Dash light on?
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  #1  
Old 10-22-2009, 04:29 PM
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Join Date: Aug 2004
Location: Northern CA
Vehicle: 2001 Ford F150
Posts: 36
Battery Dash light on?
2000 Ford150 Supercrew, 4.6L, Auto, 4x4, 135Kmi

My dash battery warning light intermittently comes on at any random RPM above idle. At idle it almost never comes on. Sometimes it blinks and sometimnes it stays on for minutes while on the freeway.

Here's what I've done.
--Replaced my old battery with new one.
--If I remove the negative battery cable the engine dies. Not sure if that diagnostic trick applies to these newer vehicles.
--Battery voltage while idling is 13.9volts. So alternator does have some output.
--Cleaned alternator connections.

Any thing alse I should check?

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  #2  
Old 10-22-2009, 04:52 PM
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Join Date: Apr 2008
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Replace the alternator, sounds like a bad diode
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  #3  
Old 10-22-2009, 05:55 PM
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Join Date: Aug 2004
Location: Northern CA
Vehicle: 2001 Ford F150
Posts: 36
Is the diode inside the alternator or can I just replace the voltage regulator thats attached to it?
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  #4  
Old 10-22-2009, 06:06 PM
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you would have a very hard time finding parts for an alternator...its just not done that way anymore...get a remanufactured unit from a parts store.
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  #5  
Old 10-23-2009, 11:10 AM
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Join Date: Aug 2004
Location: Northern CA
Vehicle: 2001 Ford F150
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I replaced the Alternator and problem is gone. Was $139 with Lifetime warranty.
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K&N intake/filter, ProComp 265/75R16 M/T tires, 12Klb MM Winch. Gets lots of 4x4 use...
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  #6  
Old 10-23-2009, 04:33 PM
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right on
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