What is your voltage at idle? - Ford Powerstroke Diesel Forum
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post #1 of 42 Old 01-20-2011, 04:08 PM Thread Starter
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What is your voltage at idle?

I have a edge cts insight and noticed that at idle my voltage would get a low as 12.4v for long periods of time. And sometimes I would get up to 14.0v at idle at time then it would drop down to 13.0v. Is that a normal voltage reading? I just replaced my batteries not even a month ago. Is this a sign of the alternator going bad? I noticed on the cts it sort of flickers when the voltage drops so low.
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post #2 of 42 Old 01-20-2011, 04:12 PM
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Not sure about the alternator, but it very well could be it.

I use a Scangauge II and it reads at idle 13.7-14.2. Never lower than that at idle.

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post #3 of 42 Old 01-20-2011, 04:13 PM
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Check your ground connections. Especially the pass side in front of block where the battery ground cable gets bolted to the block.

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post #4 of 42 Old 01-20-2011, 05:38 PM
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I had similar readings and it ended up being my alternator. I would get it checked.

Mine reads 13.7 to 14.2 now.

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post #5 of 42 Old 01-20-2011, 05:42 PM
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Mine never reads below 13.5
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post #6 of 42 Old 01-20-2011, 05:51 PM
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Sounds like your alternator.
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post #7 of 42 Old 01-20-2011, 09:01 PM Thread Starter
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Im leaning more towards alternator with all ya'lls replies. Does anyone know how many amps a 2003 f350 with the 6.0 alternator would put out?
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post #8 of 42 Old 01-20-2011, 09:05 PM Thread Starter
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I have nothing loading.


Lilpooh

I will check on that a.s.a.p.
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post #9 of 42 Old 01-20-2011, 09:34 PM
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Mine also is 13.7 to 14.2V

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post #10 of 42 Old 01-21-2011, 10:13 AM
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There is two alternators if I remember correctly. A high output one and a standard one. A standard one should be fine unless you're drawing tons of power for accessories.
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