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#1 Nate G

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Posted 06 March 2010 - 12:34 AM

Ok, My wife purchased a certified 2007 Yukon Denali and when I turn the key to "ON" but do not start the vehicle, the battery dies in 10 minutes (not completely, but it will not start after that)

I was thinking about installing a 2nd battery as there is already a 2nd battery tray under the hood... I am going to "remotely" isolate the battery. Meaning, I'm going to install a heavy duty 200amp relay that can be controlled from inside the vehicle so she would never have to get out, open the hood, wait for someone to give her a jump, etc... She would always have "On Demand" power to start the vehicle without ever stepping out.

My question is, how much current does the starter draw, and will a 2 or 4ga welding cable be enough to get the job done? A buddy of mine thinks it would be too much power going to the starter, but my reasoning to counteract his thoughts were "Its just like another car pulling up, hooking up, and giving it some juice, right?"

I'm using a welding cable because it is more flexible than a battery cable to fish around the engine bay.

Thoughts, comments, concerns? If I am missing anything let me know.

#2 pm26

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Posted 06 March 2010 - 11:18 AM

Ok, My wife purchased a certified 2007 Yukon Denali and when I turn the key to "ON" but do not start the vehicle, the battery dies in 10 minutes (not completely, but it will not start after that)

I was thinking about installing a 2nd battery as there is already a 2nd battery tray under the hood... I am going to "remotely" isolate the battery. Meaning, I'm going to install a heavy duty 200amp relay that can be controlled from inside the vehicle so she would never have to get out, open the hood, wait for someone to give her a jump, etc... She would always have "On Demand" power to start the vehicle without ever stepping out.

My question is, how much current does the starter draw, and will a 2 or 4ga welding cable be enough to get the job done? A buddy of mine thinks it would be too much power going to the starter, but my reasoning to counteract his thoughts were "Its just like another car pulling up, hooking up, and giving it some juice, right?"

I'm using a welding cable because it is more flexible than a battery cable to fish around the engine bay.

Thoughts, comments, concerns? If I am missing anything let me know.


A typical V8 starter motor will be rated at about 2Kilowatts power, so current = power/voltage, or 2,000 watts/12 Volts = 166 amps. The initial draw to get the starter motor spinning may be quite a bit higher, but it last only for a moment.

#3 Gregorio

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Posted 06 March 2010 - 11:37 AM

Ok, My wife purchased a certified 2007 Yukon Denali and when I turn the key to "ON" but do not start the vehicle, the battery dies in 10 minutes (not completely, but it will not start after that)

I was thinking about installing a 2nd battery as there is already a 2nd battery tray under the hood... I am going to "remotely" isolate the battery. Meaning, I'm going to install a heavy duty 200amp relay that can be controlled from inside the vehicle so she would never have to get out, open the hood, wait for someone to give her a jump, etc... She would always have "On Demand" power to start the vehicle without ever stepping out.

My question is, how much current does the starter draw, and will a 2 or 4ga welding cable be enough to get the job done? A buddy of mine thinks it would be too much power going to the starter, but my reasoning to counteract his thoughts were "Its just like another car pulling up, hooking up, and giving it some juice, right?"

I'm using a welding cable because it is more flexible than a battery cable to fish around the engine bay.

Thoughts, comments, concerns? If I am missing anything let me know.



Make sure that the vehicle has the latest software updates for charging issues. My 2007 did the exact same thing until they fixed it. There is a bulliten out on this. Make sure they give you a new battery because yours is trash now.

This was a weekly occurrence especially in the summer for some reason. After the update, it never happened again.

As far as installing a second battery, you can go 100% factory. Pickup trucks have a couple second battery options. Some are isolated and some are not. I can't remember if it was here or the dmax diesel site that had a post describing all the part numbers you will need including tray, cables, fuses, etc. Honestly, it will not be necessary to go throught the trouble once you get reflashed and a new battery.

Edited by Gregorio, 06 March 2010 - 11:37 AM.


#4 Gregorio

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Posted 06 March 2010 - 11:41 AM

If you search with the words second battery there are at least 4 or 5 very informative threads that pop up!

#5 Thurman

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Posted 06 March 2010 - 11:49 AM

Certain '07 GM vehicles, particularly in the SUV/truck category had a BCM problem causing a "parasitic" draw on the electrical system. I know--my '07 GMC Sierra had this. Three times getting stranded with a dead battery under the 36,000 mile warranty. Four (4) visits to the local dealer and the same answer-"you must be leaving your lights on". A phone call to 1-800-GM-give a damn and I got permission to take it to another dealer. They told me up front of the BCM problem, put in a new battery, re-programmed the BCM, and all has been well since. Just my experience, David

#6 sonjaab

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Posted 06 March 2010 - 08:07 PM

Ask your dealer to check his GM computer for a VIS on your truck to see if Recall/TSB #07033 BCM reprogram code 406CA has been performed.

This is for a battery discharge issue with certain 07 gmt-900 trucks.
Mine was one of them even tho. I had no battery discharge issues and was done while it was at the dealer for normal PM services.

Edited by sonjaab, 06 March 2010 - 08:08 PM.

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#7 MS3DALE

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Posted 06 March 2010 - 08:40 PM

#07033B: Service Update for Inventory and Customer Vehicles-Battery Rundown-Expires with Base Warranty - (Feb 15, 2007)


Subject: 07033B -- Service Update for Inventory and Customer Vehicles - Battery Rundown -- Expires with Base Warranty


Models: 2007 Cadillac Escalade, Escalade ESV, Escalade EXT

2007 Chevrolet Avalanche, Silverado, Suburban, Tahoe

2007 GMC Sierra, Yukon, Yukon XL


Purpose:
This bulletin provides a service procedure to reprogram the body control module (BCM). On these vehicles, and under certain conditions such as operating the radio with the engine off, the battery can become discharged, preventing engine start-up.

This service procedure should be completed as soon as possible on involved vehicles currently in dealer inventory and customer vehicles that return to the dealer for any type of service during the New Vehicle Limited Warranty coverage period.

Vehicles Involved:
A list of involved vehicles currently in dealer inventory is attached to the Administrative Message (US) or Dealer Communication (Canada) used to release this bulletin. Customer vehicles that return for service, for any reason, and are still covered under the vehicle's base warranty, and are within the VIN breakpoints provided below, should be checked for vehicle eligibility in the appropriate system listed below.

Year
Division
Model
From
Through

2007
Cadillac
Escalade
7R100158
7R350607

2007
Cadillac
Escalade ESV
7R136311
7R350603

2007
Cadillac
Escalade EXT
7G100001
7G274360

2007
Chevrolet
Avalanche
7G100002
7G274351

2007
Chevrolet
Silverado
71500002
71606869

7E500001
7E513617

7F500001
7F500145

7G500016
7G506215

7Z500001
7Z549763

2007
Chevrolet
Suburban
7G100004
7G274344

7J100041
7J318223

7R136280
7R350609

2007
Chevrolet
Tahoe
7J100002
7J318216

7R100001
7R350613

2007
GMC
Sierra
71500001
71606870

7E500003
7E513603

7F500004
7F500140

7G500017
7G506220

7Z500002
7Z549756

2007
GMC
Yukon
7J100040
7J318228

7R100040
7R350611

2007
GMC
Yukon XL
7J108390
7J318203

7R137014
7R350599


Important: Dealers are to confirm vehicle eligibility prior to beginning repairs by using GMVIS. Not all vehicles within the above breakpoints may be involved.

Service Procedure:
Important: The calibration numbers required for this service procedure are programmed into control modules via a Techline Tech 2® scan tool and the Techline Information System (TIS) terminal with the calibration update. Use TIS 2 Web version 2.0 for 2007 (available on 02/04/07) and on TIS DVD version 2.0/2007 or later, that was mailed to dealers on 02/14/2007. If you cannot access the calibration, call the Techline Customer Support Center and it will be provided.

Notice: Before reprogramming, please check the battery condition to prevent a reprogramming error of any of the modules due to battery discharge. Battery voltage must be between 12 and 16 volts during reprogramming. If the vehicle battery is not fully charged, use jumper cables from an additional battery. Be sure to turn off or disable any system that may put a load on the battery, such as automatic headlamps, daytime running lights, interior lights, heating, ventilation, and air conditioning (HVAC) system, radio, engine cooling fan, etc. A programming failure or control module damage may occur if battery voltage guidelines are not observed.

The ignition switch must be in the proper position. The Tech 2® prompts you to turn ON the ignition, with the engine OFF. DO NOT change the position of the ignition switch during the programming procedure, unless instructed to do so.

Make certain all tool connections are secure, including the following components and circuits:

• The RS-232 communication cable port

• The connection at the data link connector (DLC)

• The voltage supply circuits

DO NOT disturb the tool harnesses while programming. If an interruption occurs during the programming procedure, programming failure or control module damage may occur.

DO NOT turn OFF the ignition if the programming procedure is interrupted or unsuccessful. Ensure that all control module and DLC connections are secure and the TIS terminal operating software is up to date.

Tech 2 Pass-Thru Method for the Body Control Module (BCM)
Verify that there is a battery charge of 12 to 16 volts. The battery must be able to maintain a charge during programming. Use an additional jump battery if necessary.
• If the vehicle will not start, test and charge the battery. Refer to SI for battery testing and charging information, if required.

• If the battery will not hold a charge, replace the battery. Do NOT replace the battery unless it can’t be charged or a leak and/or physical damage is present.

Connect the Tech 2 to the vehicle and the TIS terminal.
Turn the ignition to the ON position with the engine OFF.
After all warning chimes inside the vehicle have stopped, turn on the Tech 2.
On the TIS terminal go into SPS Programming.
Select Pass Thru programming.
Follow instruction on the TIS terminal. When you get to the Supported Controllers screen.
7.1. Scroll down in the top box and select BCM (Body Control Module).

7.2. In the lower box select Normal.

7.3. Select Next.

Important: Vehicles without the Driver Information Center (DIC) and power door locks/windows will have two calibrations from which to choose. A selection is requried before you can select NEXT. Select calibration 25814828. Do not select calibration 25788372.

Select NEXT when the calibrations screen displays.
Follow on-screen prompts until programming is completed.
When programming is complete.
10.1. Turn off Tech 2.

10.2. Turn the ignition switch to the OFF position.

Wait 30 seconds.
Turn the ignition switch to the ON position with engine OFF.
Turn on the Tech 2.
Go into diagnostics and check for DTC codes.
Clear all codes.
Important: Failure to successfully reprogram the BCM may result in the odometer displaying mileage in metric units instead of English units. To reset the odometer to display mileage in English units, remove the 10 amp fuse from the underhood BEC. Do not reinstall the fuse for 5 minutes.

Important: After reprogramming the body control module (BCM) the driver information center (DIC) will display tire pressure values as dashes. Do not perform the Tire Pressure Monitor Reset procedure. The Remote Control Door Lock Receiver (RCDLR) will update the instrument cluster with tire pressure values during the next driving event. The vehicle must reach a speed of 40 km/h (25 mph) in order for the RCDLR to update the display.

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#8 pm26

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Posted 06 March 2010 - 11:55 PM

Remember, the only thing that is free of charge is a dead battery.

#9 MS3DALE

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Posted 07 March 2010 - 12:11 AM

Remember, the only thing that is free of charge is a dead battery.


:dunno:

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'07 SILVERADO Z71 LT2 "VortecMAX" 6-Liter,"Super-Duty" Auto Trans,9 1/2" rear-end w/3.73 G80 Locker,XM,On-Star,BOSE speaker system,Stabilitrak,Block Heater,Sunroof,18" ARE "Cannon" Wheels w/LT275/65R18 Goodyear Wrangler AT/S tires.
Custom tune by Justin at Black Bear,CORSA "Sport" exhaust system,EXTANG "Full-Tilt" snapless tonneau cover,Rough Country 1.5" front leveling kit,Fabtech 1" rear lift blocks,EZ-Down tailgate damper.
GM accessories...Hood Deflector,Molded Mud-Flaps,Ventvisors,Catch-All Floor-Mats,Bedrail Protectors,BedRug Bedliner & Bedmat,and a GM Performance Parts cold-air intake.

2011 CAMARO 2SS/RS - LS3/M6 - Inferno Orange Met. - HURST short-throw - Roto-Fab CAI - Kook's LTs - CORSA exhaust - Black Bear tuned (playtoy!)
2012 CRUZE 1LT - Blue Topaz Met. - RS pkg.- Convenience pkg. (work car!)

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#10 Nate G

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Posted 07 March 2010 - 12:41 AM

Thanks guys, it sounds to me like that TSB was never installed on the Denali. which is why it is STILL draining. I appreciate the help.

#11 fast86gn

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Posted 07 March 2010 - 07:54 AM

I went out yesterday and my truck started fine, 5 hours later...dead. Should I bother bringing it in, never happened before?
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#12 sonjaab

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Posted 07 March 2010 - 10:10 AM

Fast......................Is the first no start condition you have had?
I will also note that my almost 3 yo gmt-900 had a dead battery last week.
Dealer replaced battery under warranty . All good now.

#13 brims

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Posted 07 March 2010 - 04:35 PM

Remember, the only thing that is free of charge is a dead battery.


That's a good one, I laughed pretty loud.
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Possible mods: rear sway bar, blacked out front and rear bumpers

#14 reidrhollander

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Posted 07 March 2010 - 06:43 PM

I have found with my GMT900 the battery runs dead if there is ANYTHING turned on. As a for instance in my GMT800 I had my radar detector hard wired and nerver turned it off and it never ran the battery down, even when it sat at the airport for a week or so. In my GMT 900 I had to wire it to switched power because the truck will not start if it is left on. Even if it is for one night. Is it possible that my '09 needs a similar update?

I experienced the same thing with a relay I put in that has only a tiny LED drawing power. Seems kind of weak to me, I feel my car battery should be able to run an LED without killing the truck.

#15 CEP

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Posted 13 January 2011 - 07:24 PM

I had the dead battery problem for a few months in my 2007 Silverado and had been searching for an answer. Was left stranded a few times and I purchased a portable jump starter that was a good temporary fix. A trip to Firestone to check the charging system after one episode revealed no problems. Finally reached the max frustration point and ran across this GM-Trucks forum. Other site called Carcomplaints.com had description of problem but no answers. I saw that Body Control Reprogram 07033 might be possible solution so took vehicle in. Was just out of 36-month basic warranty but shop replaced battery with dead cell and reprogrammed module at no charge as I had paperwork showing that I had looked into problem before warranty expired. All has been good for 2 weeks now. I have been receiving monthly Onstar reports since 2007, and there was no mention of a recall. I pointed this out to the shop and that may have softened them also, as they were ready to charge $. Seems like Onstar report system would be the best place to receive recall info but perhaps has some holes.

Thanks to folks below that took the time to post a solution. :confused:




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