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Dual Battery

How do I setup dual batteries in NBS 5.3L Silverado

Re: Dual Battery

Postby GMman » May 06 2012, 4:31pm

I just popped in new battery that matched the other one. Ran 00 gauge cable from - post to ground on engine, ran + 00 cable to + side of other battery. No isolater needed " unless you want ". Have always done it this way and run winches, extra lights. Isolater would let you run one battery down while isolating one battery for starting. I never turn my rig off when I ever winched or run extra lights, loads. Get the best batteries " best reserve power " you can that match.
Thank you
Ken
2010 GMC Sierra SLE Crew 4x4 Z71 5.3L
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Re: Dual Battery

Postby stacaz » May 08 2012, 3:33am

I'd really like to keep the two batts isolated. Why run the risk of one bad one taking the other with it? Just looking for where others have installed the isolator. Where have you mounted it??

Thanks!

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Re: Dual Battery

Postby stacaz » May 08 2012, 4:04am

Where do you mount it? Anyone have pictures??

Thanks,

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Re: Dual Battery

Postby bbrown » May 08 2012, 10:27pm

I didn't take pics but I could do it...I have mine mounted to the PCM cover. The thick plastic cover on my PCM happens to be in a great spot near the battery and alternator. Let me know if you want some pics.
K&N/Custom Intake, Banks Headers & Tuner, Dual FM Exhaust, 8K HID low beams & Fogs, 1100 watt Infinity & JL Stereo, 200A Alt, 3 Batteries, Power Acoustik PD-740NBT, RV camera, Hayden Tranny Cooler, 246 heads, 1.8 roller rockers
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Re: Dual Battery

Postby stacaz » May 08 2012, 10:29pm

What's the clearance to the hood? A pic would be cool.

Thanks!
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Re: Dual Battery

Postby bbrown » May 09 2012, 7:12pm

Well in a 2001 model, the PCM is not near the hood...it's down low. So pics of mine probably won't help you.
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Re: Dual Battery

Postby dbrakeman » Mar 06 2013, 12:51am

I know it's tempting to just throw another battery in but you need to install an isolator. By adding an extar battery you create a voltage drop when you're charging. The drop is on both batteries. You need that 14.4 volts because if it drops below 13.8 the batteries won;t charge easily and if it drops to 13 they will barely charge at all.

Look at www.atct-guardiansys.com. They specialize in wireless isolators with a "smart" system to get the batteries to peak quickly.

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Re: Dual Battery

Postby bbrown » Mar 06 2013, 9:31pm

Just taking another opportunity here to promote the Hellroaring Technologies Battery Isolator Combiner. These units are more compact and way
more versatile than the standard BICs. Take a look:
http://www.hellroaring.com/bic75300.php
I've had one in my truck for 3 years now and it's never given me any problems or left me stranded with dead batteries. I put one in with added batteries for 2 reasons: RV trailer and Stereo
K&N/Custom Intake, Banks Headers & Tuner, Dual FM Exhaust, 8K HID low beams & Fogs, 1100 watt Infinity & JL Stereo, 200A Alt, 3 Batteries, Power Acoustik PD-740NBT, RV camera, Hayden Tranny Cooler, 246 heads, 1.8 roller rockers
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Re: Dual Battery

Postby steved » Mar 07 2013, 2:57am

dbrakeman wrote:I know it's tempting to just throw another battery in but you need to install an isolator. By adding an extar battery you create a voltage drop when you're charging. The drop is on both batteries. You need that 14.4 volts because if it drops below 13.8 the batteries won;t charge easily and if it drops to 13 they will barely charge at all.



dbrakeman



The charging system doesn't know if its charging a single battery or a bank of six batteries...it will charge the same.

Case in point, most diesel pickups and offroad equipment run dual batteries without an isolator..they are simply paralleled in and have absolutely zero issues. This 2012 Silverado has a 160A alternator, my last pickup (a 2004 2500 Dodge Cummins) only had a 137A alternator and had zero problems with the batteries in 275k miles.

Unless one battery goes bad, it is not a problem. Further, I have seen more issues with aftermarket isolators than they solve.

I fully intend to drop a second battery in later this spring, I don't plan on adding an isolator.
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Re: Dual Battery

Postby bbrown » Mar 07 2013, 3:22am

Looks to me like Steved has made his mind up. I probably wouldn't have spent the money for a BIC either but my secondary batteries are deep cycle AGMs not SLI. So, I want to keep those isolated to I can use them for RV power when dry camping and running the stereo. But if you keep your engine on, then no worries.
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