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Deka Battery Isolator - 120 Amp

Deka Battery Isolator - 120 Amp

Item # DW08771
Our Price: $97.68
Battery Charger
Shipping Weight: 2 lbs
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This 120-amp battery isolator enhances your alternator performance for efficient charging, maximum power, longer battery life, and safer operation. Protects main starting battery from auxiliary drain. Regulates current for multi-battery system. 1-800-940-8924 to order Deka battery charger part number DW08771 or order online at etrailer.com. Free expert support on all Deka products. Great prices and Fastest Shipping for Deka Battery Isolator - 120 Amp. Battery Charger reviews from real customers.
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  • Reviews (32)
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Deka Battery Charger - DW08771

  • 6V
  • 12V
  • 24V
  • 36V
  • 48V
  • 50V
  • Battery Isolators
  • Deka
  • Vehicle Battery to Auxiliary Battery

This 120-amp battery isolator enhances your alternator performance for efficient charging, maximum power, longer battery life, and safer operation. Protects main starting battery from auxiliary drain. Regulates current for multi-battery system.


Features:

  • Ideal for automotive, marine, and RV applications
  • Enhances your alternator performance for
    • Efficient charging
    • Maximum power
    • Longer battery life
    • Safer operation
  • Protects main starting battery from auxiliary drain
  • Regulates current for multi-battery system


Specs:

  • Application: alternators with amperage ratings below 120 amps
  • Capacity: 120 amps
  • Overall dimensions: 6-1/2" long x 4-1/2" wide x 2-1/2" tall excluding bolts
  • Quantity: 1
  • 1-Year limited warranty


Note: It is recommended that you purchase an isolator with an amperage rating above that of your alternator to prevent any damage to the isolator.


In a multi-battery system, the battery with the lower state of charge will drain power from the battery with the higher state of charge. This battery isolator protects your starting battery power so that no matter how weak your accessory battery becomes, the accessory battery will never drain power from the starting battery. This battery isolator also saves time by allowing simultaneous charging of both batteries. The amount of current flowing into each battery is determined by its state of charge, which guarantees that each battery will get fully charged, prolonging its life.



08771 Deka Battery Isolator - 120 Amperes




California residents: click here


Customer Satisfaction Score:


Customer Reviews

Deka Battery Isolator - 120 Amp - DW08771

Average Customer Rating:  4.7 out of 5 stars   (32 Customer Reviews)

This 120-amp battery isolator enhances your alternator performance for efficient charging, maximum power, longer battery life, and safer operation. Protects main starting battery from auxiliary drain. Regulates current for multi-battery system.

by:

While it was a challenge to put it in our motorhome, once installed, it works perfectly. It appeared almost identical to the original one I removed on our 1996 Road Trek.



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Going to give it a 2500 mile test run t omorrow.



by:

Ordered by phone with Gwen and Stacy's help and elected to pickup the battery isolator in Wentzville, Missouri. Price was great and it has a one-year warranty. Within an hour or two they emailed it was ready. Pickup was also quick and professional. Item is an exact replacement for the 25-year-old failed part in terms of form, fit and function. Installed without rewiring or drilling and is working great! This could not have been a better experience!



by:

Great selection and very reasonable prices, many with discounts, often cheaper than that big online site. Particularly impressed with customer service when I had a product issue, called me right away and offered replacement item immediately with free UPS return label.



by:

Great service, just what I needed. Thank you.



by:

Product as described. Great price and speedy delivery



by:

All I can say is that Etrailer ROCKS! Ordered on Tuesday and got it Thursday. The only thing better is if I could’ve picked it up myself!

Thanks Etrailer for fantastic service!



by:

Charges our auxiliary battery with no p roblems.



by:

Haven't installed it yet. Delivery was quick and the product was what I ordered.



by:

So far it works fine.



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Prompt service and the product seems to work great



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On time great service



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The 95 amp isolator is an excellent unit. Used on my RAM 2500 diesel pickup for my pop-top camper, this unit is quite sufficient to keep both my dual truck batteries and dual camper batteries charged by my 160 amp OEM alternator. Quality gear; Highly recommended!
Mike
Lt. Col. USMC (Retired)



by:

Timely delivery arrival, very good packing job, undamaged NEW items arrived due to good customer service. This is definitely a high quality unit. The heat generating epoxy-sealed electronics are protected from overheat by a generous amount of blue-anodized extruded aluminum cooling fins. This is a good value, and it is the reason that I bought 2 of them... One for use, and another for a back-up, in case I have a shorted battery... Keep-up the good work!



by:

The battery isolator l purchased from you guys is serving me well with no issues.l don't have to worry about my starter battery running down except for unrelated reasons.



by:

Wiring instructions left a lot to be desired



by:

Second one of these I have bought. Worked well but was fried when my alternator went bad. Great timely delivery and price.


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See what our Experts say about this Deka Battery Charger

  • Wiring Isolation Solenoid DW08771 on 1993 GMC 3500
    You are correct when using the DEKA isolator part # DW08771 on a vehicle like yours you wouldn't use the E post.
    view full answer...
    Image 1 for
  • Battery Isolator Recommendation for 2012 Toyota FJ Cruiser Running Second Battery
    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.
    view full answer...
    Image 1 for
  • Wiring Diagram for Deka # DW08771 Battery Isolator
    I've found a wiring diagram for the # DW08771 Battery Isolator. Terminal 1 would connect to the positive battery terminal of the main battery. The original wire from the alternator to the main battery would be removed from the battery and installed on terminal 1. Terminal E would connect to an ignition circuit that's hot only when the key is switched on via a 6 amp breaker. Terminal A would connect to the battery lead on the alternator and Terminal 2 would connect to the positive terminal...
    view full answer...
    Image 1 for
  • Will Battery Isolator Work With Lithium Battery Bank
    Yes, the Battery Isolator # DW08771 will work with your lithium battery bank set up.
    view full answer...
  • Will the Battery Isolator Voltage Result in the Battery Being Undercharged
    I contacted our technical representative at Deka and he stated it all depends on your alternator on your vehicle. If you have a remote sense alternator, the charge time will increase by 50%. Your battery will gain its full charge from your vehicles alternator. You wouldn't need to worry about your battery being undercharged. The remote sense alternator provides highly accurate voltage readings and optimizes your vehicle battery state-of-charge. This results in the improved efficiency and...
    view full answer...
  • Will Both Truck Batteries in a 2009 Chevy Silverado 3500 Drain if Trailer Stays Connected
    It depends on how the batteries are wired to your 2009 Chevy 3500. If the batteries are not connected to each other then only one battery will drain. If they are connected in any way directly to each other then both batteries can drain. In that situation using a battery isolator will prevent both batteries from draining. I recommend # DW08771 because it protects your main starting battery from auxiliary drain (from the trailer). It will also regulate current for a multi-battery system. You...
    view full answer...
  • Deka Battery Isolator Wiring From Main Battery
    The 'E' connection you are referring to on the Deka Battery Isolator # DW08771, is the connection made to any of your vehicle's high amperage remote turn on lead, or ignition wire. This connection will not go to your ignition coils positive number 15 terminal.
    view full answer...
    Image 1 for
  • How Does DEKA Isolator part # DW08771 Attach to Two Batteries
    I attached a diagram that shows how the DEKA Isolator part # DW08771 that you referenced needs to get wired to a vehicle with two batteries. Basically the center isolator post gets the alternator connection and then position 1 goes to the battery that cranks the vehicle starter and position 2 goes to the auxiliary battery positive terminal. The fourth terminal of this would not get used. The fourth one is the one with the smaller diameter threads.
    view full answer...
    Image 1 for
  • How to Wire the Deka Battery Isolator item # DW08771
    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 original wire from the alternator to the main battery would be removed from the battery and installed on terminal 1. Terminal E would connect to an ignition circuit that's hot only when the key is switched on via a 6 amp breaker. Terminal...
    view full answer...
    Image 1 for
  • Installing DEKA Battery Isolator with Two Wire Alternator
    You would not need a new plug. You would run the positive wire from the alternator to the 1 and A post of the Isolator # DW08771. Check out the attached picture for a wiring diagram.
    view full answer...
    Image 1 for
  • Where to Install Charger With Alternator and Main/Auxiliary Battery Setup With Deka Battery Isolator
    Following the diagram for the # DW08771 wiring, the charger will need to be wired directly to the battery you want to charge. If you want to charge the other battery you will either need an additional charger, or you will have to unhook the charger and attach it to the other battery. The "magic" effects will work on the battery you have the charger connected to. The same is also true for the solar panel, it will need to be attached directly to the battery you want to charge. I have attached...
    view full answer...
  • How to Wire Deka # DW08771 Battery Isolator
    I've found a wiring diagram for the # DW08771 Battery Isolator. Terminal 1 would connect to the positive battery terminal of the main battery. The original wire from the alternator to the main battery would be removed from the battery and installed on terminal 1. Terminal E would connect to the an ignition circuit that's hot only when the key is switched on via a 6 amp breaker. Terminal A would connect to the battery lead on the alternator and Terminal 2 would connect to the positive terminal...
    view full answer...
    Image 1 for
  • Installing the Deka Battery Isolator In Marine Application With Outboard Motor
    For your outboard motor on a boat applicaiton, when installing the Deka Battery Isolator - 120 Amp # DW08771 you can just connect the alternator terminal to the starting battery as you mentioned. This will still isolate a second battery in the format that you have stated. I've attached a diagram to help and it shows the dotted line from the alternator back to the positive terminal of the battery. This will allow the second battery to charge with ignition on, but will not allow second...
    view full answer...
    Image 1 for
  • Can The Deka Battery Isolator Charge Two Battery Banks
    Yes, the Deka Battery Isolator # DW08771 can charge two separate battery banks and will automatically adjust the current to send more to the battery bank with the lower charge level.
    view full answer...
  • Using Deka Battery Isolator to Charge Battery Bank on Shuttle Bus
    The Deka Battery Isolator # DW08771 is what you'd need for what you are looking to do. I attached a wiring diagram that shows how it wires up but basically you'd just need to wire the battery 2 auxiliary you see in the picture as a battery bank wired in series like you are wanting. This adapter then would allow you to charge these batteries as needed without draining the vehicle battery.
    view full answer...
    Image 1 for
  • How To Install Deka Battery Isolator DW08771 On Outboard Motor with No Alternator
    Yep you've got it! You'll hook the A terminal of the Deka Battery Isolator # DW08771 up to your starting battery, the E terminal to an power source that only has power when your outboard motor is running, and then the 2 terminal to your secondary battery.
    view full answer...
  • Do You Hook Up E Terminal On Deka Battery Isolator DW08771 On 2000 Toyota Tundra?
    I checked out that alternator, and you do not have a group 1 alternator on your 2000 Toyota Tundra, but you will need to to still use the E terminal due to your built in regulator and sense terminal. You do not use terminal E of your # DW08771 for a group 1, but you need to use it on your style of alternator.
    view full answer...
  • What Are The Terminal Functions For The Deka Battery Isolator DW08771
    For The Deka isolator # DW08771, Terminal A will connect to the alternators battery lead. Terminal E will go to the hot ignition circuit via a 6 amp circuit breaker. I have included a wiring diagram below for your reference.
    view full answer...
    Image 1 for
  • Wiring Diagram and Instructions for the Deka Battery Isolator
    Hey Dan, so it looks like to wire up the Deka Battery Isolator # DW08771 you'd need to start by connecting terminal 1 to the positive battery terminal of the main battery. The original wire from the alternator to the main battery would be then be removed from the battery, and installed on terminal 1. Terminal E would need to be connected to the an ignition circuit that's hot only when the key is switched on via a 6 amp breaker. Terminal A would connect to the battery lead on the alternator...
    view full answer...
  • Wiring Diagram for Battery Isolator Use with Two 6 Volt Golf Cart Batteries
    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 recommended that you purchase an isolator with an amperage rating above that of your alternator to prevent any damage to the isolator. I've attached a wiring diagram as you requested to assist, just where you see battery 2 auxiliary you will...
    view full answer...
    Image 1 for Image 2 for
  • How to Wire Up a Sure Power 120 Amp Two Battery Isolator
    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 appropriately for the battery. Output from the second battery positive post will then go to the items you want to power. I have included a picture that should help. If you do not have a group 1 alternator then the E post will not be used. The...
    view full answer...
    Image 1 for
  • How to Wire a Two Battery Universal Isolator # DW08771 on 2002 Ford E450
    As long as your two marine batteries are wired parallel and are essentially one battery you will wire the Sure Power Two Battery Universal Isolator, # DW08771, that you referenced as follows: The A post will go to the alternator output. The number 1 post will go to the vehicle main battery positive post. And the number 2 post will go to the auxiliary battery through a circuit breaker to the positive battery post.
    view full answer...
  • Isolator for Charging Start and Auxiliary Lithium Battery
    We have isolators like the Deka part # DW08771 which was designed for this situation. It will charge both batteries while also keeping them separate which means they wouldn't be in parallel.
    view full answer...
  • How to Charge Trailer From Secondary Battery with Isolator
    It sounds like you currently have an isolator like the Deka # DW08771 installed between your primary and secondary battery on the trailer. If this is the case, then running a 12V wire from the 7-Way connector to the secondary battery positive post should give you exactly what you are looking for. I have included a diagram that might help with the wiring for this setup.
    view full answer...
    Image 1 for


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Do you have a question about this Battery Charger?


Info for this part was:

Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Laura H
Written by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Mike S
Updated by:
Mike S
Employee Andy C
Installed by:
Andy C

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