Battery Isolator Recommendation for 2012 Toyota FJ Cruiser Running Second Battery

Question

Question:

Need to install a deep cycle second battery on my 2012 Toyota FJ Cruiser for winch and auxiliary lighting. Would like to use a high CCA battery. I have a stock alternator that I believe is a 100 amp type. Your recommendations with wiring diagram would be helpful. Thanks.

asked by: RogerGagne

1

Helpful Expert Reply:

Since the alternator of your 2012 Toyota FJ Cruiser is rated for 100 amps the Deka isolator part # DW08771 that you referenced would be exactly what you are looking for. I attached a wiring diagram for this isolator for you to check out as well.

expert reply by: Jameson C

1

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Answer 1

I went on Deka's website and found a wiring diagram I have attached below. To install the Deka Battery Isolator item #DW08771 you will want to follow these steps: Terminal 1 would connect to the positive battery terminal of the main battery. The…

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Answer 2

For your battery isolator similar to #DW08771, you will have connection posts for each battery and for an alternator. The main battery will connect to position one and the alternator to the A post. The second battery will attach to the 2 via a…

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Answer 3

The Deka Battery Isolator - 120 Amp #DW08771 will allow you to hook up to a 12V ignition battery as well as two 6V golf cart batteries connected in series. This is a great choice as long as your alternator amperage rating is below 120 amps. It is…

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Answer 4

The Deka Battery Isolator - 120 Amp #DW08771 will work with alternators with amperage ratings below 120 amps so it will work well with your 63-74 alternator with external regulator. You will simply connect it as the attached diagram shows. The extra…

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Answer 5

You have it figured out. You will need an appropriate length of 10 Gauge Wire, item #10-1-1, and a 40 amp circuit breaker, item #PK54540, to provide 12 volt power to the trailer connector at the rear of your FJ. This will provide a maintenance charge…

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Answer 6

I'm happy to help with that isolator and wiring. I checked your invoice and see you went with the Battery Isolation Solenoid #PK5231201. This is a good choice and will need to be mounted to the frame because it uses the mounting holes for ground.…

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Answer 7

If you intend to wire the two batteries together they should be the same type but if you want to add a second independent battery for the winch/lights/stereo it can be a different type and/or have a different amp-hour (Ah) rating. A separate system…

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Answer 8

When installing the Deka Battery Isolator - 120 Amp #DW08771 you actually do not tap into the ignition systems. Instead you will run the wire from the alternator to the A post on the Isolator, then run a wire from the number 1 post of the isolator to…

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Answer 9

Battery isolator #DW08771 will have connection posts for each battery and for an alternator. The main battery will connect to position one and the alternator to the A post. The second battery will attach to the 2 via a circuit breaker that is rated…

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Answer 10

You can put a maintenance charge on your trailer battery with the 12 volt accessory circuit of the 7-way. The 1:00 position of your 7-way carries this circuit. You would just need to run a length of 10 gauge wire like part #10-1-1 (sold by the foot),…

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Answer 11

Since you have the Hopkins Insight Brake Controller, I confirmed with Hopkins that the red light staying on is completely normal. I also confirmed with Hopkins that the red light will not drain your 2010 Ford F-250's battery to the point where…

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Answer 12

Hey Steve, so the most similar option that would be an upgrade to what you have now would be the Redarc BCDC charter part #331-SBI12-BLD which will do a great job managing all of the batteries in your setup that need to be charged. This has an output…

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Battery Isolator Recommendation for 2012 Toyota FJ Cruiser Running Second Battery

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