Delay in charging voltage - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 02-16-2011, 01:51 PM Thread Starter
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Delay in charging voltage

I have noticed that when I first start my truck for the day or I let it cool completely my voltage reads low 11.7ish for about the first 90-120 seconds the truck is running and then it will jump up to the correct 13.8-14.2. Is this common on these trucks? Does the alternator not put out charging voltage immediately?

Just not something I am used to seeing in my years of gas engine work.


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post #2 of 6 Old 03-19-2011, 06:25 AM
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Mine does this as well.
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post #3 of 6 Old 03-19-2011, 06:51 AM
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The lower voltage reading is the glow plugs being on for the 90-120 to help the truck to run smooth and cleaner when cold. This is normal , when the glow plugs shut off , the voltage comes up. Being able to see this in your ammeter gauge ,means your batteries are getting weak. I put in 2 new batteries and have not seen this in 2 years since .

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post #4 of 6 Old 03-19-2011, 07:19 AM
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^^ What he said.


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post #5 of 6 Old 03-19-2011, 11:24 AM
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Mine does it even with two brand new batteries. I don't think it's anything to worry about. I get the voltage reading on my SR7 display.
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post #6 of 6 Old 03-20-2011, 09:05 AM Thread Starter
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Quote:
Originally Posted by greasyF250 View Post
The lower voltage reading is the glow plugs being on for the 90-120 to help the truck to run smooth and cleaner when cold. This is normal , when the glow plugs shut off , the voltage comes up. Being able to see this in your ammeter gauge ,means your batteries are getting weak. I put in 2 new batteries and have not seen this in 2 years since .
I hope this isn't the case because I knew one of my batteries was weak so I replaced both and I still see it. The glow plug info makes sense though.


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