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2005 Silverado 5.3 Generator Overcharging


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#1 JMBurgess

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Posted 07 February 2011 - 11:27 PM

This forum is great, nice to see people trying to help.
I'm not sure where to take this, everytime I take a truck over to the dealer I seem to have a unique probelm, wanted to see if this one is
I have an 05 Silverado crew cab, Z71 5.3L , I bought it with 66,000km's on it in 07 and ahve 88,000kms on it now.
The Voltage has always been stable 14 give or take 1 or 2 nomal fluctuations. Noticed my battery not standing up as well and the Volmeter with increased fluctuations: Down to 12 up to 15 / restart trk - stable, jump to 16, So I changed the Battery, Startup stays stable at 14 and a bit, Drive - jumps higher, Changed the Generator.
This lasted a day and now at startup shows 14 and climbs - Stopped at the parts store and they said voltage output was (showing low) at the time and gave me a replacement.
Checked tonight with the meter 15.66v, this seems a little excessive.
Now I'm not sure if this is related but started bout the same time - Steam (smells Burn't) coming somwhere from the middle/top of the rad and a strange noise like the fans are having trouble cutting in. But they did.
My cable connections seem tight, doesn't make a difference what loads I apply, heater, stereo w/amp lights nothing.
I'm worried I'm going to fry something, saw some issues with battery cables and one issue with the continuity off the (ALt) harness.
Any Suggestions on whether they're related or why i'm overcharging? p.s no clutch on the Generator for that Voltage protection towing system
Thank you

#2 Foghorn14

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Posted 08 February 2011 - 06:15 AM

May be normal..........

Service Information 2007 Chevrolet Silverado - 4WD | Sierra, Silverado VIN C/K Service Manual | Document ID: 2394671
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#07-06-03-009B: Information on Voltmeter Gauge Fluctuation Due to Regulated Voltage Control System and Concerns About Camper/Trailer Battery Charging - (Feb 5, 2010)


Subject: Information on Voltmeter Gauge Fluctuation Due to Regulated Voltage Control System and Concerns About Camper/Trailer Battery Charging


Models: 2005-2010 Cadillac Escalade Models

2005-2010 Chevrolet Avalanche, Silverado, Silverado Classic, Suburban, Tahoe

2005-2010 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 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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#3 JMBurgess

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Posted 08 February 2011 - 06:40 PM

May be normal..........

Service Information 2007 Chevrolet Silverado - 4WD | Sierra, Silverado VIN C/K Service Manual | Document ID: 2394671
--------------------------------------------------------------------------------

#07-06-03-009B: Information on Voltmeter Gauge Fluctuation Due to Regulated Voltage Control System and Concerns About Camper/Trailer Battery Charging - (Feb 5, 2010)


Thanks, I've seen that one,
I don't have a second battery, and no effect is shown applying a load to the system when it's this high.
Restart it and is stays down for awhile
my concerns are when I started this up after work, she sat at 14.5 (est) great, but on the mile & 1/2 trip home she just climbs, tested in the driveway and it's hitting 15.98v at the battery terminals. It's never been that high and I kind of think it shouldn't especially with a new battery to go with it. over 16 starts to burn wires if i'm not mistaken.

#4 nccrew

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Posted 08 February 2011 - 06:54 PM

Not sure helpful but my 2006 used to fluctuate like the bulletin says - I recently replaced the battery and now it really never drops below 14 and hovers around 15 most of the time regardless of load - - I put in an Optima Red Top so thinking that is the culprit......bottom line is the battery type may make the difference......





May be normal..........

Service Information 2007 Chevrolet Silverado - 4WD | Sierra, Silverado VIN C/K Service Manual | Document ID: 2394671
--------------------------------------------------------------------------------

#07-06-03-009B: Information on Voltmeter Gauge Fluctuation Due to Regulated Voltage Control System and Concerns About Camper/Trailer Battery Charging - (Feb 5, 2010)


Thanks, I've seen that one,
I don't have a second battery, and no effect is shown applying a load to the system when it's this high.
Restart it and is stays down for awhile
my concerns are when I started this up after work, she sat at 14.5 (est) great, but on the mile & 1/2 trip home she just climbs, tested in the driveway and it's hitting 15.98v at the battery terminals. It's never been that high and I kind of think it shouldn't especially with a new battery to go with it. over 16 starts to burn wires if i'm not mistaken.


2006 Silverado Crew Cab 4WD

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#5 JMBurgess

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Posted 08 February 2011 - 07:23 PM

Not sure helpful but my 2006 used to fluctuate like the bulletin says - I recently replaced the battery and now it really never drops below 14 and hovers around 15 most of the time regardless of load - - I put in an Optima Red Top so thinking that is the culprit......bottom line is the battery type may make the difference......





May be normal..........

Service Information 2007 Chevrolet Silverado - 4WD | Sierra, Silverado VIN C/K Service Manual | Document ID: 2394671
--------------------------------------------------------------------------------

#07-06-03-009B: Information on Voltmeter Gauge Fluctuation Due to Regulated Voltage Control System and Concerns About Camper/Trailer Battery Charging - (Feb 5, 2010)


Thanks, I've seen that one,
I don't have a second battery, and no effect is shown applying a load to the system when it's this high.
Restart it and is stays down for awhile
my concerns are when I started this up after work, she sat at 14.5 (est) great, but on the mile & 1/2 trip home she just climbs, tested in the driveway and it's hitting 15.98v at the battery terminals. It's never been that high and I kind of think it shouldn't especially with a new battery to go with it. over 16 starts to burn wires if i'm not mistaken.



I stayed with the A/D Delco brand as those we've always had a long life with, but
You Know, I went with a higher cranking amp battery 735 or 760 as opposed to a 630 that was in there, I wonder if that could make the difference, as senstive as these systems seem to be. I'll Stop by the parts store and see if they'll let me try tyhe smaller one and see if that's it




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