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post #1 of 5 Old 10-31-2010, 09:39 AM Thread Starter
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possible grounding issue

I'm wondering if someone could tell me where or direct me where to look to find a wiring schematic for an 03 f250 6.0. I'm thinking possible grounding problem. For the last 6 weeks or so my battery light comes on when I start in the morning and flickers and eventually will go out but it always starts. But yesterday morning early I was driving down the road with headlights on and after 10 miles or so the flickering began again with the lights dimming along with it then going back to bright over and over again for 3 miles. Went to advanced auto parts and everything seems fine, but I don't want to be stranded if I can repair it before I do.

03 f-250 CCLB FX4 6.0. H-11 studs, egr delete, swamps 58 v ficm, sct sf3, autometer ultralight boost, pyro and trans temp. Complete 08 bed. And a few other things
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post #2 of 5 Old 10-31-2010, 11:18 AM
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Originally Posted by BK1977 View Post
I'm wondering if someone could tell me where or direct me where to look to find a wiring schematic for an 03 f250 6.0. I'm thinking possible grounding problem. For the last 6 weeks or so my battery light comes on when I start in the morning and flickers and eventually will go out but it always starts. But yesterday morning early I was driving down the road with headlights on and after 10 miles or so the flickering began again with the lights dimming along with it then going back to bright over and over again for 3 miles. Went to advanced auto parts and everything seems fine, but I don't want to be stranded if I can repair it before I do.
Have you checked the voltage at the batteries when the light comes on. Should be a minimum of 13-13.5 volts. A little lower than 13 can cause your light to flicker and when you get down to 12.5 or less the light will stay on since you are actuall using more power than what the alt. can replace.

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post #3 of 5 Old 10-31-2010, 12:35 PM Thread Starter
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A friend has a digital voltmeter and I will borrow it to find out. Thanks

03 f-250 CCLB FX4 6.0. H-11 studs, egr delete, swamps 58 v ficm, sct sf3, autometer ultralight boost, pyro and trans temp. Complete 08 bed. And a few other things
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post #4 of 5 Old 10-31-2010, 12:37 PM
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A friend has a digital voltmeter and I will borrow it to find out. Thanks
There is a way you can monitor your voltage through your cluster. If you want to, I can tell you how but it would be easier over the phone than typing it out.

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post #5 of 5 Old 10-31-2010, 03:24 PM
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Also, have Advance or somewhere else run a check on the alternator. My Voltage Regulator was breaking down internally, intermittently and their tester had a printout similar to an oscilloscope and it showed it was breaking down some times.

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