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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.Quick Guide (pdf)
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.9 ★★★★★
Based on 22 reviews
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Product Reviews
★★★★★ 5
Men's relaxed fit cardigan
Size: XX-Large, Color: Dark Blue Stripe Knit, Size: XX-Large, Color: Dark Blue Stripe Knit
This Amazon Essentialsl men's relaxed fit cardigan is a stylish option for men. The cardigan is short sleeved and relaxed in fit. I ordered an XXL for my huband, which is his normal size, and it fits him well and is relaxed through the shoulders and body of the cardigan. The one we chose is blue and white striped with a white border on the sleeves and hem and a white collar. It's 100% cotton and is soft to the touch. It looks really nice on my husband, and he says it feels comfortable to wear. The weight is somewhat heavy, so I think for him, he will mostly wear it when it's a bit cooler. It gets very hot here in summer, but this will be nice when the weather cools off. He often wears short sleeves in colder months, too. This cardigan can be machine washed in cold, but it should be dried flat (the way you generally dry sweaters so they'll keep their shape). It's a very nice looking cardigan, and it looks great on my husband. I'm very pleased with the style and the quality.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 23, 2026
★★★★★ 5
Unbeatable Price! Great Quality!
Size: Medium, Color: Dark Green Stripe Knit, Size: Medium, Color: Dark Green Stripe Knit
I was very impressed with the softness and quality of this shirt. I am 6'1 and 195 lbs. and the medium shirt was a perfect fit. I will agree that the size is true to fit. The only thing I didn't like was the length. The length is short, so it comes to just to the top of my waist when wearing, however, that is the style of this cardigan. A longer length is my personal preference since I am taller. Also, with this being cotton, I would not recommend putting this garment in the dryer as it will likely shrink. The color (I got green) is just as pictured and the green and navy color mix blend well together. Although knitted, you do not see through the shirt, so an undershirt is not required. The price tag is unbeatable as you will not find a knitted cardigan anywhere else at this low price. Overall, I think it is a great buy, and I would highly recommend it.
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Reviewed in the United States on April 24, 2026
★★★★★ 5
Great fit.
Fit Type: Regular Fit, Color: Charcoal Heather/Charcoal Heather, Size: 5X-Large Big
Im 6'4 360lbs. They're not thick but and the neck is a little looser than what im use to. But overall im happy with the quality and the length of the shirt. I got a big belly and the shirt doesn't expose any of my belly and not too long where. It looks like a tall tee. Definitely will grab these again.
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Reviewed in the United States on June 3, 2026
★★★★★ 5
Quality!
Fit Type: Regular Fit, Color: Charcoal Heather/Charcoal Heather, Size: Small
The quality of these shirts surprise me and I recommend them to anyone.
Great fit, beautiful heavyweight fabric that feels soft to the touch.
Amazing!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 28, 2026
★★★★★ 5
Very nice. Excellent price.
Fit Type: Regular Fit, Color: Black/Black, Size: X-Large
I ordered the two pack black tee-shirts.
Really nice quality. And decent price.
Better than the equivalent from two other major brands.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 11, 2026
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