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#1
12-27-2009, 12:15 PM
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05 excursion diesel BATTERY LIGHT
The battery light comes on when driving... the batteries we sluggish the other day but had both front and rear heaters full blast for a short trip, so I charged the batteries. It cranks and starts fine but Battery light is still on.... can drive it 5- 10 miles and it still starts after I stop, so not sure if the alternator is just putting out enough,... or if the batteries are getting old after a little over a year???
Last edited by mikeolivertx; 12-27-2009 at 12:16 PM. Reason: a 
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#2
12-27-2009, 05:34 PM
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Re: 05 excursion diesel BATTERY LIGHT
I would say alternator. Take it to AutoZone or O'reilly's, They'll test it for free. BTW wouldn't be driving it too much if it's the alternator, unless you wanna walk home.
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#3
01-15-2010, 01:32 AM
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Re: 05 excursion diesel BATTERY LIGHT
Under/Over charging alternator can cause it as well as a bad cell in a battery.
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