SKU: 39622358520

Newmar 2-3-120a Isolator 2ait 3batt 120amp

Sale price$274.21 Regular price$304.68
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Ships within 48 hours · Estimated delivery Jul 30 - Aug 4

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Description

Newmar 2-3-120a Isolator 2ait 3batt 120ampThese heavy duty isolators allow charging multiple batteries automatically from one or two alternators, and prevent discharge or 'dumping"" of one battery into another. Each battery is charged according to its need without overcharging. rated for 12 48 volt negative ground DC systems. feature conservatively rated diodes and a rustproof anodized aluminum heat sink case. Models are available for 70, 120 and 165 amp alternators. Features: Heavy duty

These heavy duty isolators allow charging multiple batteries automatically from one or two alternators, and prevent discharge or 'dumping"" of one battery into another. Each battery is charged according to its need without overcharging. rated for 12-48 volt negative ground DC systems. feature conservatively rated diodes and a rustproof anodized aluminum heat sink case. Models are available for 70, 120 and 165 amp alternators.

Features:

  • Heavy duty construction
  • Rated for systems up to 48 volts DC, negative ground
  • Rust-proof anodized aluminum case
  • Stainless steel mounting hardware provided
  • Protective covers provided for terminals

Performance Specifications

  • Operating temperature: -40° to +80° C
  • Duty cycle: Continuous rating to 50° C Derate linearly to 70% @ 80° C
  • Temp. rise: 5° C at full rated current (mount vertically for optimum cooling)
  • Voltage drop: 0.7V @ 50% load, 0.9V @ full load

Note: These battery isolators are not compatible with self exciting alternators. Please consult the manufacturer of your alternator if you are unsure of your configuration.

 

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 39622358520

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4.6 ★★★★★
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Volodymyr Bilov
Draper, US
★★★★★ 5
super delivery
Size: 5 Liter
excellent quality, super delivery
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Reviewed in the United States on February 15, 2026
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Gearheaddaddy
Birmingham, US
★★★★★ 5
Black but don’t worry it is supposed to be. It works!
Size: 1 Liter
This stuff looks like used motor oil but don’t worry that is the molybdenum disulfide (MoS₂) which is black. This stuff in a small engine makes it smooth as silk. I used it all season in my leaf vacuum small engine. I could hear the difference. It was quieter and smoother.
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Reviewed in the United States on December 7, 2025
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Matthew Vaughn
Battle Creek, US
★★★★★ 5
High Quality Oil
Size: 5 Liter
Good quality oil! I was just buying the mos2 separate until now
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Reviewed in the United States on January 15, 2026
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Francisco Antonio
Birmingham, US
★★★★★ 5
Recomendado
Size: 5 Liter
Uno de los mejores aceite
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Reviewed in the United States on March 11, 2026
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DanPurserMD
Battle Creek, US
★★★★★ 5
Works just like the Mercedessource guy said it would.
Size: 5 Liter
After viewing a Mercedessource video (trusted Mercedes repair advice Youtuber and blogger) on which oil he liked for higher mileage Mercedes he pointed this out Semi-synthetic 10w-40 out. Called it “muddy” oil. Said it possibly helped with small oil seal leaks and seemed to slow oil loss in higer miles Mercedes. Also made the engines run more quietly. So I have been using in my wife’s high mileage Mercedes (185,000miles W211 2004 E500 4matic) which we baby and I work on. A true very high compression super car, everything he said at Mercedessource has turned out to be accurate. No more leaks. Quiet lifters. Cooler running. Wow. I had been using Mobil 1 full synthetic 0W-40 European Car Formula exclusively but tried this for the seal protection. Works great and no, it is not Mercedes spec but I will see when the harsh Utah winter hits. May switch to the Liqui-Moly 5W-40 Leichtlauf full synthetic (which does meet Mercedes 722.9 oil spec) for winter (I change the oil every 6 months regardless). Thanks for reading.
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Reviewed in the United States on July 12, 2018

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