P1000 Maintaining dual battery set-up

[my99svt]

I've searched but I can't find an answer. How do you hook a battery tender up with a dual battery isolator. Do you charge both batteries somehow? Just the secondary?

 

[ghost]

i just charge the primary.
Once its fully charged, the isolator opens to allow charging of secondary

 

[Jimmyscoin]

i just charge the primary.
Once its fully charged, the isolator opens to allow charging of secondary

What he said. Just buy the harness and attach it to your main battery.

Amazon.com: Battery Tender 081-0069-6 Ring Terminal Harness with Black Fused 2-Pin Quick Disconnect Plug: Automotive

 

[my99svt]

Great, thanks guys! This forum is full of good people with lots of info!


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[Corona1]

I was wondering the same thing. Thanks for asking and for the answer.


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[Bubba]

So when the tender charges the primary up and the isolator blue light comes on and lets both batteries charge my tender keeps charging and never goes from red charging to green charged. Blue light never goes back off. Gages show 14.1 volts on both batteries so I know they are charged. The tender should go to green then! How does you guys work?

 

[Kenjones21]

So when the tender charges the primary up and the isolator blue light comes on and lets both batteries charge my tender keeps charging and never goes from red charging to green charged. Blue light never goes back off. Gages show 14.1 volts on both batteries so I know they are charged. The tender should go to green then! How does you guys work?

mine does same thing.... How do you have your ground hooked up? I've got mine hooked to the factory battery , I'm thinking of changing the 2nd battery ground to the frame and see how the tender works then.

 

[Bubba]

Same as you. Isolator to frame and 2nd battery to main battery.

 

[Tramguage1]

Give Dennis a call at (509) 991-0385. He is the designer and manufacturer of the True isolator. Hes in Washington state so check the time difference. He can answer any questions you guys may have .

 

[Bubba]

Good ideal! I have talked to him before.

 

[utvmi]

Any update on this, Did anyone find out an answer to this ?/..Thanks

 

[Bubba]

I never did.

 

[ghost]

Are you sure nothing is running on the second battery while it is charging?
Try disconnecting all custom accessories and check if the battery gets fully charged.

 

[Bubba]

The light on the true isolator staying on makes the tender keep charging.

 

[ohanacreek]

i just charge the primary.
Once its fully charged, the isolator opens to allow charging of secondary

@ghost is Right charge the primary and the secondary will charge once the primary hits 12.8v.

I have had mine set up like this from day one and it's worked fine.


If you have a radio or something else with a parasitic drain it WILL not be able to charge the battery and will eventually kill the battery it's connected to. I learned that the hard way.

 

[Bubba]

So your main battery charges up, light comes on the isolator letting the second battery charge , when second battery is charged your battery tender will shut off ?

 

[zin01]

I think what they are saying is that the blue LED on the true isolator is enough of a drain that the battery tender will never "fully charge" the second battery and therefor the tender will not shut off. It makes sense to me. Also I wired my winch to the second battery and the dash switch for the winch has a LED light and so the battery tender is basically supplying power to both those LED's and will not turn off.


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[Bubba]

That's right! the blue light on my isolator is not letting the tender shut off when the second battery is charged.

 

[truc577]

I think what they are saying is that the blue LED on the true isolator is enough of a drain that the battery tender will never "fully charge" the second battery and therefor the tender will not shut off. It makes sense to me. Also I wired my winch to the second battery and the dash switch for the winch has a LED light and so the battery tender is basically supplying power to both those LED's and will not turn off.


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I had the same issue and installed a master switch. Switches are cool and all, but they cause some issues


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[ohanacreek]

So your main battery charges up, light comes on the isolator letting the second battery charge , when second battery is charged your battery tender will shut off ?

no it stays connected until the primary drops to 12.7

I think what they are saying is that the blue LED on the true isolator is enough of a drain that the battery tender will never "fully charge" the second battery and therefor the tender will not shut off. It makes sense to me. Also I wired my winch to the second battery and the dash switch for the winch has a LED light and so the battery tender is basically supplying power to both those LED's and will not turn off.


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. No im saying if you have a radio or USB ports that stay powered 24/7 that will drain you battery.

That's right! the blue light on my isolator is not letting the tender shut off when the second battery is charged.

right the isolator stays on once the primary is charged. The light is just status is maybe a milliamp not enough to run the batterys down in a year. My tender goes to float Mode once it reaches full charge.

You have more of a drain than you think somewhere try disconnecting the accessories all together and just have the batteries connected via the ISO.