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Old 01-03-2012, 03:15 PM
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Battery voltage on CTS question?

I noticed yesterday morning, the coldest we've had by far here in Md, in the low 20's, my battery voltage on CTS was only reading 11.5 - 11.7 at first cold start up once truck was running. After about 30 seconds of idling, voltage was up to 13.5-13.9 where it normally is. FICM was fine whole time as well, 47.5-48.5. Didn't sound like truck had a hard time starting and turning over. Is that okay or normal for voltage to be that low at startup when that cold outside? And the way it crept up to 13.5 after 30 seconds normal as well? Thanks for the help

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Old 01-03-2012, 03:20 PM
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Seems normal; mine does the same. The truck will keep the glow plugs on for a bit right after start and that pulls the voltage down. After the plugs turn off, voltage jumps right back up to 14 or so. Although, I thought that the plugs stayed on about 2 min in temps like that.

-Hemicbx
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Old 01-03-2012, 03:26 PM
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Yep, completely normal.
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Old 01-03-2012, 03:42 PM
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Yep, that's normal. The glow plugs can continue to run to heat for up to 2 minutes I believe. Which will keep the battery voltage low.
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Old 01-03-2012, 03:53 PM
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Seems normal to me...
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Old 01-03-2012, 03:55 PM
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Cool, that's what I was hoping to hear, and it may have been two minutes and not 30 seconds, I wasn't really counting


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