SKU: 29754369615

ARCO Marine BI-1203-3A Battery Isolator - 120A - 1 Alternator, 3 Battery

Sale price$157.94 Regular price$175.49
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Description

ARCO Marine BI-1203-3A Battery Isolator - 120A - 1 Alternator, 3 BatteryBI 1203 3A Battery Isolator 120A 1 Alternator, 3 Battery The Arco Marine BI 1203 3A is an inboard outboard battery isolator that can handle 1 alternator, 3 batteries, and 120A max. Rated for use with 10 to 350 amp alternators on 12, 24, or 32 volt negative ground systems. *Includes exciter terminal Features: 1 alternator, 3 batteries, 120A max Inboard and outboard battery isolators are solid state devices that allow electrical current to flow in one

BI-1203-3A Battery Isolator - 120A - 1 Alternator, 3 Battery

The Arco Marine BI-1203-3A is an inboard/outboard battery isolator that can handle 1 alternator, 3 batteries, and 120A max. Rated for use with 10 to 350-amp alternators on 12, 24, or 32-volt negative ground systems.

*Includes exciter terminal

Features:


  • 1 alternator, 3 batteries, 120A max

  • Inboard and outboard battery isolators are solid-state devices that allow electrical current to flow in one direction ONLY, thus permitting the alternator to be connected directly to two batteries without fear of one higher-charged battery discharging into the lower-charged battery.

  • Both batteries are always being charged automatically, in proportion, to their needs whenever the engine is running.

  • When battery isolators are used in conjunction with selector switches, it is not necessary to change the switch position to provide for charging of both batteries.

  • Isolators provide proportioning of the output or charging current on the alternator to the batteries as required, regardless of switch position.

NOTE: Battery Isolators cannot be used on 12 volt charging systems with 24 volt trolling motors or newer outboard engines with rectifier-regulator charging systems.

This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.
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: 29754369615

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4.8 ★★★★★
Based on 12 reviews
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Chuck
Louisville, US
★★★★★ 2
handlebar mittens
Too big. If using during snow plowing they are a burden due to need to take hands off controls, and shift from forward to reverse. Might be okay if just riding around on trails, etc.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 8, 2025
S
Verified Purchase
Some guy
Grantham, US
★★★★★ 4
Good quality, not great on clutch
The quality of these is very good. They break the wind very well. Too well, actually. On my bike when going above 60 MPH they press hard enough on the clutch to be a problem. I'm sure I'll still use them but they won't be of any value on the interstate. It's possible to hold the clutch while using them but, for me at least, I don't have the strength to do it for my 45 minute commute. Unfortunately, the openings seem to fold up making it difficult to get gloved hands into them quickly, which is my reason for subtracting a star.
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Reviewed in the United States on November 12, 2025
F
Verified Purchase
Fabian
Natrona Heights, US
★★★★★ 5
Sedan
Size: Compatible with 2002-2006 BMW E46 3-Series Sedan, Color: Chrome, Size: Compatible with 2002-2006 BMW E46 3-Series Sedan, Color: Chrome
Perfect fit for a 2002 325i sedan, locks in place and does not fall out.
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Reviewed in the United States on March 4, 2026
C
Verified Purchase
Charles Livingston
Charlottesville, US
★★★★★ 5
Perfect fit
Size: Compatible with 2002-2006 BMW E46 3-Series Sedan, Color: Glossy Black
Perfect fit for the 2004 E46 BMW.
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Reviewed in the United States on October 20, 2025
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Verified Purchase
MR
Draper, US
★★★★★ 4
Price
Size: Compatible with 2002-2006 BMW E46 3-Series Sedan, Color: Glossy Black M-Color Dual Line
I installed this on an e46 325ix sedan, they only worked, one of them is just a little loose. I don't know how long they last, because every time I open the bonnet, the lever bothers me a little?
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Reviewed in the United States on March 19, 2023

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