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i am getting ready to install a dual battery system for my car, and i have seen battery isolators and battery relays out there. what is the difference between the two, i have very limited space under the hodd for an isolator, but if they both do the same thing, i can just get the smaller relay. any info would be greatly appreciated.
 

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An isolator will allow you to keep both charged at the same time. A relay will allow you to switch between the two.
 

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the battery "relay" is also called a battery seperator. The isolator is a diode pack, will not work with all cars charging systems (like some GM's) and willl ahve a voltage drop across it. THe seperator just connects the second battery to the first when the ignition is on. Its cheaper, easier and does almost all the same stuff without a voltage drop!

Brad
 
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