Batteries
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Joined: Jun 2012
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Batteries
What should voltage be on my batteries when they have sat overnight, and i come out to start it up? What is normal operating voltage after it has warmed up?
When i go and start my truck usually after ive let it sit at work after my 12 hr shift, it start/cranks slow and always fires right up, but the voltage lags around 11.1- 11.2 and the battery light comes on. After a couple seconds go by the battery light goes out, the voltage jumps to 13.2- 13.9 and the idle goes to normal. I thought i may have had weak batteries, but went in to get em tested today, and they both checked out great.
Any thoughts?
When i go and start my truck usually after ive let it sit at work after my 12 hr shift, it start/cranks slow and always fires right up, but the voltage lags around 11.1- 11.2 and the battery light comes on. After a couple seconds go by the battery light goes out, the voltage jumps to 13.2- 13.9 and the idle goes to normal. I thought i may have had weak batteries, but went in to get em tested today, and they both checked out great.
Any thoughts?
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Joined: Aug 2001
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May have both weak batteries and a weak alternator.
You should see around 12.6-12.8 volts at the battery @ 70 degrees. The colder it is the voltage drops. It wouldn't be uncommon to see 12.3-12.4 @ 32 degrees.
You should see around 12.6-12.8 volts at the battery @ 70 degrees. The colder it is the voltage drops. It wouldn't be uncommon to see 12.3-12.4 @ 32 degrees.
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Joined: Apr 2012
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What should voltage be on my batteries when they have sat overnight, and i come out to start it up? What is normal operating voltage after it has warmed up?
When i go and start my truck usually after ive let it sit at work after my 12 hr shift, it start/cranks slow and always fires right up, but the voltage lags around 11.1- 11.2 and the battery light comes on. After a couple seconds go by the battery light goes out, the voltage jumps to 13.2- 13.9 and the idle goes to normal. I thought i may have had weak batteries, but went in to get em tested today, and they both checked out great.
Any thoughts?
When i go and start my truck usually after ive let it sit at work after my 12 hr shift, it start/cranks slow and always fires right up, but the voltage lags around 11.1- 11.2 and the battery light comes on. After a couple seconds go by the battery light goes out, the voltage jumps to 13.2- 13.9 and the idle goes to normal. I thought i may have had weak batteries, but went in to get em tested today, and they both checked out great.
Any thoughts?
you need an alternator that outputs 14.5~14.8 volts. the OEM will never
do that. ever.
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