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  #21  
Old 07-08-2008, 11:19 PM
Zodiac Zodiac is offline
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I just wanted to add...

Some times a battery isolator might be a good idea too.

The idea of an isolator is that both batteries get charged, but only one battery will get drawn down if you leave your key or lights on.

In my 1991 K2500, I have dual Cat batteries, but I do NOT have an isolator, as I like my plow to draw from BOTH my batteries, not just one.

But someday, and I'm not sure when this'll be, I'll post diagrams on how to wire up a switch and relays so both batteries charge, but one runs the plow, the other runs the truck. If your truck battery dies, you can flip the switch and use it to jump start your own truck.
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  #22  
Old 07-09-2008, 02:46 AM
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Quote:
Originally Posted by Zodiac View Post

But someday, and I'm not sure when this'll be, I'll post diagrams on how to wire up a switch and relays so both batteries charge, but one runs the plow, the other runs the truck. If your truck battery dies, you can flip the switch and use it to jump start your own truck.
Done many that way as well Chad. I like to use a 3rd (or even a 4th depending on the situation) battery in those circumstances if space allows. Plenty of power, plus reserve power to spare...the best of both worlds.
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  #23  
Old 07-09-2008, 08:06 PM
Zodiac Zodiac is offline
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You've seen my truck...

I'm quickly headed towards four batteries.

Where I'll put them I do not know.
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  #24  
Old 07-09-2008, 09:41 PM
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I usually make a custom box/cross members and mount them between the frame rails under the bed, using sealed batteries and lying them on their sides for extra clearance.

Some guys are satisfied with placing them in the bed in plastic marine boxes but personally I hate to use up the bed space. Have done a couple were I mounted them inside of a bed mounted tool box (in the center). As long as they're inside plastic battery boxes it works well.
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  #25  
Old 09-17-2008, 09:29 PM
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i did mine last year i will post some pics also did anyone one go neg to neg or just to block ? i dont like the way its looks on the block i might run it to neg terminal
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Last edited by PLOWMAN45; 09-17-2008 at 09:32 PM.
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  #26  
Old 09-17-2008, 11:07 PM
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did anyone one go neg to neg or just to block ? i dont like the way its looks on the block i might run it to neg terminal
Could you elaborate on that plowman?
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  #27  
Old 09-17-2008, 11:40 PM
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my 2nd bat cable goes to the engine block i was thinking of running a neg cable from the second to the first
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  #28  
Old 09-18-2008, 02:18 AM
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my 2nd bat cable goes to the engine block i was thinking of running a neg cable from the second to the first
Smart thought. The more you can tie all the grounds together the better.
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  #29  
Old 09-18-2008, 06:35 AM
RichG53 RichG53 is offline
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BB You did not say if both batteries have to be the same AMPS..... To work right....Please reply......
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  #30  
Old 09-18-2008, 01:10 PM
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i have 2 of same red top optimas batterys with a 145 am in my truck
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  #31  
Old 09-18-2008, 03:38 PM
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BB You did not say if both batteries have to be the same AMPS..... To work right....Please reply......
Yes you want the batterys to be as exact as they can be...same size, same specs, and same age in order to get the most life and performance out of them, as well as the alternator.
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  #32  
Old 09-18-2008, 07:06 PM
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Thank you for your quick responds.....I have other ?? to ask maybe this weekend when I have more time to type them out.....Thanks again....
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  #33  
Old 10-07-2008, 05:05 PM
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here is mine with 2/0 gauge wiring
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  #34  
Old 11-17-2008, 01:34 AM
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I currently have a 02 GMC 2500 HD 6.0 with only 1 battery. I understand this post reflects what I can do to my truck, but the questions is....Do I need to? The dealer actual sells a complete kit to do all of this. A bit pricey though. $342.00 with a battery!

I am adding this week a Mini Lightbar with 6 strobes, 2 alleys, 2 take downs, and an additional set of Work lights off the back rack. Not sure if it matter, but I run a Fisher MM1 8 HD with SEHP motor. Is this sustainable off 1 battery, or should I upgrade?
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  #35  
Old 11-17-2008, 01:51 AM
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I think you'll be fine with a single battery, as long as it's pretty HD and in good shape, with a good alternator. Strobes don't take much power, and the other lights would probably only be on for brief periods.
I suffered through various batteries, alternators and never had enough power on my first plowtruck, a 79 Chevy. Eventually put two batteries in wired to an isolator. Had all my auxiliary stuff on one battery, and the truck running off the other. Nothing made it happy. Even put a powermaster hi-output alternator in it, I later learned that higher output alternators put out less at low rpms than a stock alternator. Anyway, I was never happy with it, someone told me they use them in sequence so I switched to that. This truck came with dual batteries in sequence from the factory, works the balls for me. I wouldn't go back to an isolator. And like B&B said, it is important to have the batteries matched in age, size, etc. So I think it must be important to use them at the same rate too.
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  #36  
Old 11-17-2008, 01:53 AM
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Thanks man, I was kinda hoping that was the case.
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  #37  
Old 11-17-2008, 01:56 AM
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didnt cost me 342.00
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  #38  
Old 11-17-2008, 01:59 AM
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I didn't think so....I will gather my own stuff when it comes time. My chin hit the floor when I heared that. Seemed a bit high for wire, battery and tray. Obviosuly it comes with more then that, but still!
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  #39  
Old 11-17-2008, 09:27 PM
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I bought a tray at the dealer for my 79, but I'm sure you can probably get a cheaper aftermarket one from LMC or JCW or somewhere. But you're biggest expense is going to be two new big batteries (gotta match them). I wouldn't go that route until you know you have to.
I think the only reason my current truck came with two batteries is for starting a pretty large diesel with high compression in cold weather.
There is a formula for adding up your amp draw vs your available current, and how many amps you can recharge your battery with in how long of a time period, blah blah blah. I just figure if I run it down on a job, I'll charge it back up on the way to the next job.
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  #40  
Old 12-05-2008, 09:10 PM
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OK so I am going to attempt this install tomorrow depending on the weather.. I just want to be clear that I can go pos to pos and neg to neg correct? Or should the neg go to the engine block off the second batt? Also should I reroute some of things wire to the original battery over to the new? or does that not make a difference?? Any help would be greatly appreciated.
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