2007 Charging system problems w/2nd battery? - Chevrolet Forum - Chevy Enthusiasts Forums

2007 Charging system problems w/2nd battery?


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Hardin Thicke's Avatar
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April 8th, 2009, 11:51 AM   #1  
2007 Charging system problems w/2nd battery?

Interested in adding an isolated 2nd battery. Was wondering if anyone has experienced charging system problems after adding one? Codes or Check Engine Light? Planning on adding a Yellow Top with a Hellroaring battery isolator.

 
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April 8th, 2009, 6:36 PM   #2  
I added a yellow top to the factory battery without a relay isolator and had no problems whatsoever. That was in my 07 Tahoe now I have an 08 and I plan on adding a Kinetik battery but probably with a relay isolator cause i dont want my system to be sounding if my car isnt cranked. Are you using it for a sound system or electronics or accessories?

 
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April 8th, 2009, 7:05 PM   #3  
That's good to hear. I was concerned as to how the intelligent charging system would react to the load of the second battery. I'm using it for amateur radio gear which pulls about 25A on transmit, but less than an 1A on receive.

 
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April 13th, 2009, 11:54 AM   #4  
Posted By: Hardin Thicke That's good to hear. I was concerned as to how the intelligent charging system would react to the load of the second battery. I'm using it for amateur radio gear which pulls about 25A on transmit, but less than an 1A on receive.

Adding a second battery isn't going to help you with your required 25 amps.. amperage comes from and always will come from the alternator. Adding a second battery without upgrading the alternator will place your alternator under greater stresses shortening its life and reducing its effectiveness. I'm not sure if the Tahoes that came with the dual batteries have beefier alternators than those without the second battery? Anyone?

Anyways, adding a second battery helps mainly one thing... Capacity: The ability to use reserve power longer without the vehicle running.

If you are looking for amperage, start with the alternator. This goes for you stereo guys as well.. adding batteries or caps without addressing your alternator is counter-productive at best.

 
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April 13th, 2009, 12:00 PM   #5  
Posted By: socaliguy81 Adding a second battery isn't going to help you with your required 25 amps.. amperage comes from and always will come from the alternator. Adding a second battery without upgrading the alternator will place your alternator under greater stresses shortening its life and reducing its effectiveness. I'm not sure if the Tahoes that came with the dual batteries have beefier alternators than those without the second battery? Anyone?

Anyways, adding a second battery helps mainly one thing... Capacity: The ability to use reserve power longer without the vehicle running.

If you are looking for amperage, start with the alternator. This goes for you stereo guys as well.. adding batteries or caps without addressing your alternator is counter-productive at best.
you are correct, but I'm going to go out a limb here and speculate that Hardin is using the equipment with the engine off and needs the extra power.. the high current draw is pulling the single battery down quick and adding the second will buy him some non-engine running time...

 
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April 13th, 2009, 5:02 PM   #6  
Correct. I will be using the equipment most of the time with the engine off. The aux. battery will be isolated from the starting battery by a Hellroaring Technologies, BIC-95150A Battery Isolator. Charging current from the alternator to the aux battery is limited by the device, so it shouldn't overload the alternator. I was concerned about how the charging system would react to another battery, but I've since been informed by the manufacturer that the device simply looks like another load on the vehicle's +12V system. We'll see... New Yellow Top is in hand, and Isolator is in transit now.


Last edited by Hardin Thicke; April 13th, 2009 at 5:19 PM.
 
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April 13th, 2009, 5:13 PM   #7  
take pics and document as much as you can, part numbers and web site too!

 
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April 15th, 2009, 8:45 PM   #8  
does anyone know what the factory amperage output on our alternators are?

 
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April 15th, 2009, 9:17 PM   #9  
Check your RPO codes int he glove box

KW1 GENERATOR 160 AMP
KW2 GENERATOR 124 AMP
KW3 GENERATOR 135 AMP
KW7 GENERATOR 170 AMP
KW9 GENERATOR 190 AMP
KXB GENERATOR 100 AMP, DUAL


Last edited by in2pro; April 15th, 2009 at 9:26 PM.
 
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