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07-12-2013, 06:58 AM #1
- Join Date
- Feb 2013
2013 Sierra Volt meter doesn't drop from 14+ volts as designed.
I just took advantage of GM's huge incentives and upgraded my 09 Sierra to a new, 2013 Sierra z71. LOVEEEE it!!
Being the stickler for details that I am, I noticed that the Variable charging rate system that fluctuated between 12-15v on my 09's volt meter(as designed) hasn't varied at all on my 2013. I only have 300 miles on the new one.
I realized(from service manual) that many conditions have to be met to lower the voltage output, but I think I am meeting those conditions and the volt meter hasn't dropped off 14+ at all. I even topped off the battery with my C-Tek charger overnight and the battery is fully charged.
Anyone have any info on this? Is it because of low miles on truck?
07-12-2013, 09:02 AM #2
- Join Date
- Mar 2007
- Grand Prairie, Texas
- Blog Entries
No insight to repairing your problem, only confirmation that yes you should see some fluctuation on the gauge.
I assume the truck is properly transitioning to 4 cyl mode.
One possibility since this system is a learning system is that it might still be putting together information on how you drive. The alternator and AFM systems take quite a few miles before they settle in and operate to their full capacity.
07-12-2013, 01:56 PM #3
We want pics of the truck!!!!!
I'll check my 2013 Silverado volt meter to see if it drops.
2013 Silverado LTZ White Diamond Crew Cab
Advent OGM1 Navigation
Husky Liners GearBox Underseat Storage
EGR Rail Caps
K&N Air Filter
Flowsound 40 Muffler
Hypertech Max Energy Tune (only top end limiter removed and AFM disabled)
Chrome Tailgate Handle Cover
TonnoPro HF-155 Tonneau Cover
WeatherTech Front and Rear Splash Guards
Husky Liners X-Act Contour Floor Liners
WeatherTech Side Window Deflectors
07-12-2013, 07:56 PM #4
It is possible, because of the way the '09 presented the voltage readings (and, my '09 reads the same), that the needle movement was dampened on the newer trucks. Maybe GM just got tired of people asking "how come the voltage gauge readings constantly change"?
I would run a couple of wires from the battery into the cab and connect a hand-held volt meter. Have someone drive and you compare the DVM to the dash gauge.Ray
'09 Avalanche LTZ - Black
'05 Envoy XL (sold)
07-12-2013, 10:16 PM #5
07-14-2013, 06:46 PM #6
- Join Date
- Dec 2012
When I got my '13 back in February I noticed that my voltmeter showed a higher charging level than my '11 when it was charging. I never noticed the truck dropping back below 14 until I probably had 2 or 3 weeks driving. Now it runs at the same level as my '11 and drops back just like the older truck. As posted by others, I bet it is in some sort of learning mode.2013 Silverado Z71 LT
07-15-2013, 03:45 PM #7
Ok, after replying to this thread back on 7/12 I kept an eye on my volt meter of my 2013 Silverado.
I can say when running that meter never drops below 14V. This appears to be just the way it is.
07-16-2013, 06:56 PM #8
drawing down the battery when the alternator drops out is also not good !
07-17-2013, 10:43 AM #9
07-17-2013, 02:29 PM #10
when operating a vehicle and the alternator drops out the discharge frequency increases this causes damage to the cells due to heat generated when the alternator starts charging the battery. heat is what also kills these batteries. like on some of these new vehicles the battery is up against the fire wall not the best place to put a battery to avoid heat since the air from the engine/radiator is in that area.
light loading of the alternator is best since it will reduce brush commutator wear . the windings and regulator also get damaged from the heat created with the constant hard charging of the battery so you can save a little fuel or perhaps for GM to pass some EPA mileage law.
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