SKU: 5108407821

Newmar 1-2-120 Battery Isolator

Sale price$103.23 Regular price$114.70
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Ships within 48 hours · Estimated delivery Aug 26 - Aug 31

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Description

Newmar 1-2-120 Battery Isolator1 2 120 Battery Isolator This heavy duty isolator allows multiple batteries to charge automatically from one or two alternators and prevents the discharge or dumping of one battery into another. Each battery is charged according to its need without overcharging and is rated for 12 , 24 , or 36 volt, negative ground DC systems. This model is a 120 amp alternator. Features: Conservatively rated diodes and a rustproof anodized aluminum heat sink case

1-2-120 Battery Isolator

This heavy-duty isolator allows multiple batteries to charge automatically from one or two alternators and prevents the discharge or dumping of one battery into another. Each battery is charged according to its need without overcharging and is rated for 12-, 24-, or 36-volt, negative ground DC systems. This model is a 120-amp alternator.

Features:


  • Conservatively rated diodes and a rustproof anodized aluminum heat sink case

  • 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

Specifications:


  • Operating Temperature: -40 to +80

  • 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

  • Alternator Sources: 1

  • Battery Bank: 2

  • Max. Amperage Input Capacity: 120

  • Stud Terminal Size: 6mm

  • Dimensions (L x W x H): 6.5" x 4.5" x 3.1"

  • Weight: 3 lbs.

Note: These battery isolators are not compatible with self-exciting alternators. The alternator must have an external excitation lead. 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: 5108407821

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4.4 ★★★★★
Based on 18 reviews
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Verified Purchase
Sal
Natrona Heights, US
★★★★★ 5
Direct Fit and good quality
Color: Single Slat Gloss Black, Size: 2002-2005 E46
For anyone that has owned an E46 knows that even the stock kidney grills are brittle plastic. This aftermarket is about the same quality as stock. It is a direct fit and has the clips where they are supposed to be to keep them in place. The look is also pretty nice. This one is all black and actually looks nice on my black E46. I would recommend especially for the price and shipping was fast.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 29, 2025
C
Verified Purchase
Christian Burt
West Palm Beach, US
★★★★★ 5
Easy install
Color: Single Slat Gloss Black, Size: 2023+G20
Fits well. Made of plastic but very easy install.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 19, 2026
M
Verified Purchase
Mecha Drew
Battle Creek, US
★★★★★ 1
I should have read all the other reviews ...
Color: Single Slat Gloss Black, Size: 2010-2013 E92, Color: Single Slat Gloss Black, Size: 2010-2013 E92
I read all the bad reviews, but I gave it a shot anyways Tabs wont clip in place and fitment is slightly off.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 1, 2026
C
Verified Purchase
Charles Sherin
Bozeman, US
★★★★★ 5
Worth it
Color: Single Slat Gloss Black, Size: 2006-2009 E92
For perfect and looks great
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Reviewed in the United States on February 5, 2026
M
Verified Purchase
Madison
Port Orchard, US
★★★★★ 5
Very nice quality
Color: Single Slat Gloss Black, Size: 2019-2022 G20
I have a 2022 330i bmw and it fit perfectly! Looks just like photos online and delivered quick!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 27, 2025

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