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Voltage too high?

Voltage too high?

Postby BrunOfOne [OP] » Jul 13 2012, 12:47am

Just got a new Silverado 1500 with the 6.2...put 300 miles on it so far. I'm used to battery voltage reading 14v in most cars... but my truck seems to be a little high. It stays there no matter how much driving i do. See pic. Measured voltage on the battery with a multimeter is 14.83v. Is this normal or is it an issue?
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Voltage too high?

Postby Machster69 » Jul 13 2012, 12:53am

Its good bro...
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Voltage too high?

Postby fenn » Jul 13 2012, 1:42am

That's fine
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Voltage too high?

Postby Machster69 » Jul 13 2012, 1:45am

^^^what he said
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Re: Voltage too high?

Postby Z15 » Jul 13 2012, 1:49am

Thats normal. The charging system in these new trucks operates differently that you seen before. You may notice the needle on the other side of the center line as well. When the system does not require charging it goes into economy mode and the needle will drop down low. Perfectly normal for the computer controlled charging system.
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Re: Voltage too high?

Postby Z71Silvy » Jul 13 2012, 2:24am

x2 on what Z15 said, took me a while to get used to seeing the gauge read about 12v on long trips with the cruise on, no worries, just the truck doing it's thing. ;)
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Re: Voltage too high?

Postby BrianST » Jul 18 2012, 9:32pm

Aha! That explains why my voltage drops off, especially when its hot outside. Trouble is, my ac compressor cuts off at that low a voltage. I've had to cheat the system by turning my headlights on if I want extended ac. At least it works!
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Voltage too high?

Postby Machster69 » Jul 18 2012, 9:41pm

Gmupfitter has the specifics on the charging system, mike nailed it tho...
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Re: Voltage too high?

Postby SilentWolf » Aug 03 2012, 4:06am

It took me a while to get used to it as well. In fact, when I first got mine (bought used at 35k miles) the dealer had to jump-start it for the test drive since it was winter and hadn't been ran in a while, and mine showed 14+ for a long time. The first time I noticed it drop down to around 12, I thought my alternator was failing.... :)
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Re: Voltage too high?

Postby BrunOfOne [OP] » Jan 07 2013, 8:07pm

So it has consistently been significantly above 14v since this original post. I just started it up (29F outside), and it reads 15.3V at the battery while running, and 12.2V while not running. The needle is ALWAYS about halfway between 14v and 19v when I drive it. In 6 months and a few thousand miles, I have only seen it below 14v once. Is it because of the cold?? Typically 12v components start to become damaged at around 16v, so I don't want to get there. Why in the world would the truck want to run at 15.3v??
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