Re: Hooking up two batteries together on my 73 c10?????
With the isolator setup the main battery is not being used so if it goes dead it does not kill the main battery to still be able to start the truck. the isolator separates the batteries until the isolator has power. I have always used this setup for high power add ons to vehicles like a stereo system or airrride. both ways will work but the isolator helps keep the main battery for starting the vehicle.
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