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voltage fluctuate on the dasboard meter

voltage fluctuate on the dasboard meter

Postby LouisB [OP] » Nov 16 2012, 3:58pm

Hi everybody, i have a question, if someone could answer me ? Is it normal that my dial voltage meter in the dashboard fluctuate. Goes up to near 15 v and then drop to appx 12.75 v and depending the demand it can goes up little above 14v ?

Very bugging situation because now i always check this meter. Sometimes doesn't move a lot and sometimes goes up and very down.

I couldn't check with my voltmeter cause it is happening when i am running, but if i stop beside the road and take a reading on my batteri pole with my voltmeter, the result is almost the same as my dial but more precise.

Got the original batterie replace last week cause i stall and needed a boost. Take no chance because cold wheater is comming i replace the batterie with a carquest original compatible 645 amp

For info, truck is a silverado 2007, 4X4, 5.3 engine
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voltage fluctuate on the dasboard meter

Postby Machster69 » Nov 16 2012, 4:16pm

Is it a new new body 2007? If so then the alternator charges according to demand... Normal
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Re: voltage fluctuate on the dasboard meter

Postby Gereke09 » Nov 16 2012, 4:20pm

i was told by my local parts store,not CQ but Federated, YES this is normal!!! it helps prolong the charging system, dont always have to run 14 volts!!! Mine is a 09 though, should be pretty close. Hope you bought the GOLD battery. I delivered for them, form dist. center to the stores here in the buckeye...sometimes you get what you pay for!!! i made the mistake of " saving money" and ended up buying the GOLD a few months later!!! thier Gold or Top of the line is very good, but you gotta spend the extra money!!! jsut keep that in mind, that was my experience buying CQ parts, from the wharehouse!!
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Re: voltage fluctuate on the dasboard meter

Postby Z15 » Nov 16 2012, 4:46pm

Subject: Information On Voltmeter Gauge Fluctuation Due To Regulated Voltage Control System And Concerns About Camper/Trailer Battery Charging


Models: 2005-2009 Cadillac Escalade Models

2005-2009 Chevrolet Avalanche, Silverado, Silverado Classic, Suburban, Tahoe

2005-2009 GMC Sierra, Sierra Classic, Yukon Models


Voltmeter Fluctuation Condition:
Some customers may comment that the voltmeter is fluctuating between 12 and 14 volts on their full size pickup or utility vehicle. Starting with the 2005 model year, light duty full size pickups and utilities are equipped with a new Regulated Voltage Control (RVC) system. This system reduces the targeted output of the generator to 12.6-13.1 volts when in "Fuel Economy Mode" to improve fuel economy. The generator may exit "Fuel Economy Mode" if additional voltage is required. This will cause the voltmeter to fluctuate between 12 and 14 volts as opposed to non-regulated systems that usually maintain a more consistent reading of 14 volts. This fluctuation with the RVC system is normal system operation and NO repairs should be attempted.

Camper/Trailer Battery Charging Concerns:
Some customers may comment that when towing or hauling a camper/trailer, the auxiliary battery for the camper/trailer will not stay charged. In most cases, this concern is blamed on the new RVC system. While the RVC system does reduce the generator's targeted output voltage to 12.6-13.1 volts when in "Fuel Economy Mode", this feature is bypassed if the tow/haul feature is enabled. With the tow/haul feature enabled, the RVC system will stay in "Charge Mode" and the targeted generator output voltage will be 13.9-15.5 volts, depending on the battery state of charge and the estimated battery temperature. To keep the generator in the "Charge Mode", use either of the following two methods.

• The first method is to use the tow/haul mode when towing or hauling a camper or trailer.

• The second method is to turn on the headlights, which will increase the generator's targeted output voltage to 13.9-14.5 volts.
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Re: voltage fluctuate on the dasboard meter

Postby Gereke09 » Nov 16 2012, 4:59pm

that was very helpful...more than i got at the parts store!!!! thanks
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Re: voltage fluctuate on the dasboard meter

Postby LouisB [OP] » Nov 16 2012, 5:07pm

Thank's a lot Z15,
You saving me a lot of concern and tylenol cause i was very wondering about what's going on.
They explanation given is very clear and helpful. That's make my day

Have a nice day
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voltage fluctuate on the dasboard meter

Postby Rangel » Nov 16 2012, 7:43pm

I noticed this on both my Yukon and Sierra. Good to know its normal. Thanks.
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Re: voltage fluctuate on the dasboard meter

Postby thegarage1410 » Jun 08 2015, 5:05am

I know this is an older subject but looking for help. I understand how the system is supposed to work. But this is confusing me and any info would be helpful. SO here is the situation:

I have owned a 2011 Silverado 1500 for the past 5 months. Bought it used with 72,000 miles. I pay attention to the gauges all the time, always have in all my previous trucks. The volt meter never moved off of 14 like everyone is describing even when towing my open deck car trailer that is equipped with a winch and hardwired battery, until this weekend. I purchased a left over 2014 Keystone RV bumper pull camper. The truck now has 85,000 miles and on my way to go camping (about 125 mile trip one way) the voltage regulator dropped to around 11 or 12. Of course I panicked and found the nearest parts store to check for a bad alternator, they said all good no problems.

After arriving to the camp grounds I noticed that the battery in the camper wasnt fully charged. Next day left camping to head home, volt meter was bouncing from 15 down to 12. Still not knowing about the RVC system I stopped once again, checked system, all ok. But not convinced I bought and installed a new 160 amp alternator. To make sure it wasn't the camper causing it, I disconnected the camper battery (which was completely dead). After about 20 miles of a normal 14 volt reading it dropped again to 12 and stayed there the rest of the 80 miles home.

So how or why would this never move from 14 before. Now that I was hauling a load with a camper up the hills that lead out of Phoenix, would the voltage drop to 11 or 12 and not go back up. I was definitely not in economy mode and it didn't charge the camper battery when it was hooked up. I did have it in and out of TOW mode with no change in the gauge (which I find out is the recommended way to have constant charging).

Just looking for any help possible before going to the dealership and shelling out tons of money if its a simple fix.
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