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  1. Battery Charger
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  3. Battery Isolators
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Deka Battery Isolator - 120 Amp
Deka

Deka Battery Isolator - 120 Amp

Part Number: DW08771
In Stock
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$103.94
Battery Charger
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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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Deka Battery Charger - DW08771

Highlights

  • Ideal for multiple applications: Perfect for automotive, marine, and RV setups.
  • 120 Amp capacity: Perfect for alternators with ratings below 120 amps.
  • Enhances battery life: Simultaneous charging prolongs battery lifespan.
  • Protects starting battery: Prevents auxiliary drain for reliable starts.
  • Wide voltage range: Supports 6V to 50V systems, ensuring flexibility.
  • Simplifies wiring: Clear terminal designations streamline installation.

Features to know about

Enhanced Alternator Performance: 120-Amp Battery Isolator

Struggling with an underperforming alternator? The Deka Battery Isolator amps up your alternator efficiency, delivering maximum power while ensuring safe operations. This 120-amp isolator is your ideal companion for automotive, marine, and RV applications, making sure your multi-battery setup gets the power boost it needs without overloading your alternator.

Protection Against Battery Drain: Main Battery Safeguard

Say goodbye to the worry of a drained starting battery when you need it the most. With this isolator, your primary battery remains protected from any auxiliary drain. Designed to regulate current impeccably, it guarantees that only the auxiliary battery gets drained, preserving your starting battery's life and performance.

Versatile Voltage Compatibility: Multi-Voltage Support

Whether you're working with 6V, 12V, 24V, 36V, or even 48V and 50V systems, the Deka Battery Isolator has got you covered. It's perfectly tailored for a variety of voltage setups, ensuring compatibility across a wide range of vehicles and applications, making it a versatile choice for any enthusiast.

Simultaneous, Simplified Charging: Time-Saving Innovation

Tired of juggling multiple batteries while charging? This isolator allows you to charge all connected batteries at the same time, easing your workload. It intelligently balances the current based on each battery's state of charge, ensuring they're fully charged without wasting your precious time.

Seamless Installation and Usage: Easy Integration

The isolator is straightforward to install and fit into your existing setup. Whether you're replacing an old isolator or integrating it into a new system, it boasts a 6-1/2" x 4-1/2" x 2-1/2" design that's compact yet powerful, making the installation an absolute breeze without rewiring or drilling hassles.

Built for Longevity: Durable Design

Designed to endure, this isolator provides a robust way to enhance battery life. Its durable build ensures that your battery system keeps running efficiently, extending the life of both your isolator and linked batteries, making it an investment for the long haul.

Specs

Application and Capacity

  • Application: alternators with amperage ratings below 120 amps
  • Capacity: 120 amps

Dimensions

  • Overall dimensions: 6-1/2" long x 4-1/2" wide x 2-1/2" tall excluding bolts

Quantity and Warranty

  • 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.

08771 Deka Battery Isolator - 120 Amperes




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Customer Satisfaction Score:

Ratings & Reviews

4.7

46 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.

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A very good company to buy from



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Great product. Good service and good contact with me.



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works



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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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Wiring instructions left a lot to be desired



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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.



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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!



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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)



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Just put it in and a big different in all things electric on vehicle.



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It worked a advertised



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In my 75 Dodge van ...works very well,!



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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!



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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.



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Easy to install and works great.



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We always get a great product from Etra iler.



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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.



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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!



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excellent service



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Put it in and works great-


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Show More Reviews

See what our Experts say about this Deka Battery Charger

  • 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...
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  • Is Circuit Breaker Needed When Wiring Deka Battery Isolator # DW08771
    When wiring up the Deka Battery Isolator # DW08771 the main/first battery will connect directly to position one on the isolator without the need for a circuit breaker. The second battery though should be attached to the second position on the isolator via a circuit breaker that is rated appropriately for the battery. The alternator will go to the A post on the isolator. I have attached a diagram that you might find helpful as well. You should not have to worry about the second battery...
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  • Wiring a Trailer With Dual Batteries and Solar Charger
    Let's try and take this one at a time to make things easier; to start with the black wire from the 7-way plug (the 12V) should be run to the pair of 12V batteries you already have in the battery box. In terms of grounding they will be grounded through your Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1225D. The LED lights each need to be grounded to the frame of your trailer; they will also be connected to the 12V batteries which would be connected to the charger. That covers the...
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  • 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...
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  • Can 13.5 Volt Output From RV Converter Charge RV Batteries
    A 13.5 volt circuit attached to batteries is going to charge them since that would be a higher voltage than what the batteries would have.
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  • 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...
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  • 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...
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  • 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...
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  • 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.
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  • How Does Deka Battery Isolator Get Wired?
    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 your starting battery, and another wire from the number two post of the isolator to the secondary battery. Since the alternator will only have power with the vehicle running, it is what keeps you from needing to tap into the ignition system. This...
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  • 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...
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  • 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.
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  • 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.
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  • 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...
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  • Wiring Secondary Battery in TorkLift HiddenPower Under-Vehicle Mount w/ Battery Box # TLA7740
    In order to prevent draining your main battery when using an inverter at night, I recommend using the Deka Battery Isolator, # DW08771, with the TorkLift HiddenPower Under-Vehicle Battery Mount with Battery Box, # TLA7740, (battery not included). The battery isolator will allow both two batteries in your 2014 Dodge Ram Pickup to charge at the same time and will protect the starting battery from being drained by the accessory battery. I have attached a drawing that shows how the isolator...
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  • 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...
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  • How do the Battery Isolators by DEKA Install on 1986 Dodge Ramcharger
    The Deka Battery Isolator # DW08770 is not vehicle-specific; it will work fine on your 1986 Dodge Ramcharger to protect the truck battery from excessive discharge and to regulate current in a multi-battery system. If your truck has a CS alternator you will use installation kit # DW08768. If it has the SI alternator use kit # DW08769. The difference will be in the part number of the alternator. An SI has SI as the last two digits of the number. The other way to tell is that the SI has...
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  • Wiring Diagram for Deka 95-amp Battery Isolator # DW08770
    The Deka Battery Isolator # DW08770 is not vehicle-specific; it will work fine on your 2007 Chevrolet Silverado to protect the truck battery from excessive discharge and to regulate current in a multi-battery system. If your Silverado has a CS alternator you will use installation kit # DW08768. If it has the standard alternator use kit # DW08769. You can tell if you have the CS130 alternator by checking for its external fan with serpentine belt pulley. I have linked a wiring diagram for...
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  • Recommended Wiring and Battery Isolator for Auxiliary Winch Battery
    Using quick connect like the Bulldog Winch Rear Wiring Kit - Quick Connect to Terminal End - 3 Gauge - 24' Long # BDW20026 you will simply connect the ends to the auxiliary battery for your winch. I recommend using a battery isolator like # DW08771 to keep the aux battery from draining the starter battery. This will allow you to charge and maintain your battery while still protecting it. If you will only be running the winch off the auxiliary battery, then you can use # 10-1-1 and circuit...
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  • 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.
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  • Deka Battery Isolator to Replace Eaton Sure Power 1202 Battery Isolator With Wiring Diagram
    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 post you asked about will not be used since you don't have a group 1 alternator, but that would be connected to a circuit breaker and eventually to the ignition switch.
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  • How To Keep Trailer Battery That Powers Winch Charged While Its Being Towed
    I would be happy to help! If the maintenance charge is enough for your battery, then running the # 10-1-1 from the 12v accessory circuit of your 7-way connector to the positive terminal of your trailer's battery using a ring terminal # DW05705-1. Keep in mind that this will not keep the battery from draining while using a winch or tongue jack, as this circuit does not offer much power. To keep the battery from going dead a better option would be running the Bulldog Winch Rear Wiring...
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  • Replacement Battery Isolator Solenoid For 2019 Jayco Precept Prestige Motorhome
    It sounds like you're trying to replace the battery isolator solenoid. This is what allows the starting battery on your 2018 Jayco Precept Prestige to charge the house batteries when the engine is running, but keeps the house batteries from draining the starting battery when the engine is not running. For a replacement you'd need the Deka # DW08771. If you mean some other kind of solenoid just let me know what it's doing, but this should be the only solenoid you have.
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  • 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.
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Info for this part was:

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