Arrives before Christmas 
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.
Features:
Specs:
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.
In a multi-battery system, the battery with the lower state of charge will drain power from the battery with the higher state of charge. This battery isolator protects your starting battery power so that no matter how weak your accessory battery becomes, the accessory battery will never drain power from the starting battery. This battery isolator also saves time by allowing simultaneous charging of both batteries. The amount of current flowing into each battery is determined by its state of charge, which guarantees that each battery will get fully charged, prolonging its life.
California residents: click here
Average Customer Rating: 4.7 out of 5 stars (42 Customer 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.We always get a great product from Etra iler.
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!
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.
Easy to install and works great.
Going to give it a 2500 mile test run t omorrow.
Put it in and works great-
excellent service
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.
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!
Great service, just what I needed. Thank you.
Charges our auxiliary battery with no p roblems.
Haven't installed it yet. Delivery was quick and the product was what I ordered.
Product as described. Great price and speedy delivery
So far it works fine.
On time great service
Prompt service and the product seems to work great
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