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hi youtubers jeff cote here with ask pys we've got a question from a boater asking jeff i'm about to install a battery combiner on my boat and i'm wondering where the connections for that battery combiner should go great question because battery combiners look pretty simple but in actuality installing them is full of pitfalls and the first one that is commonly not done properly is actually connecting a battery monitor not to the battery itself but to some other point later down and they what happens is they're actually wiring a battery combiner to what's called a switched point so the first step and the only way to make this work properly is to have a battery combiner connected to the unswitched distribution so let's have a look at this diagram so a battery combiner is this device here and what does a battery combiner do a battery combiner is basically a device that allows your batteries to be put into parallel effectively combined automatically whenever there's a charging charging voltage that's measured and that charging voltage is generally around 13.3 volts okay so that's basically what you're looking at and that's what the combiner says oh you know what time of plenty why don't we share a charge that's going on on the engine battery and share it with another battery okay so now let's have a look at um where what we're going to do here so we've got our battery combiner right here and that's that device now notice where the fuses are there's a fuse right here at the unswitched distribution right so we can't realistically you can't bring all the connections to a battery so what you end up having is having a device is called an unswitched distribution for your house battery because there would be too many connections at the battery itself for the house the engine battery it's possible because engines should not have any connections so you're going to have a fuse located right at the battery and blue seas for example makes a fuse called the marine rated battery fuse which is really useful for that so here's the trick so you've got a battery fuse located at the engine battery and you've got another battery fuse located on switch distribution now notice the battery combiner right here this device right here it is actually effectively always connected to either the engine battery or the house battery and even if the switch is on or off that combiner is always going to be connected to the battery and if you don't do that way well welcome to a world of magic and that's where boats do things that don't make any sense so you always have to follow the instructions otherwise it's just really really confusing again thanks for watching thank you for watching this pys video if you've got further questions ask them down below or go on our website to fill one of the forms don't forget to subscribe and thanks for watching