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Some devices get/provide a ground from metal to metal contact.

Totally disconnect starter battery - and + and recheck voltage. Totally disconnect house battery - and + and recheck voltage. Connect house battery + and recheck voltage : check to hull and to - battery wire.

Electrically, disconnecting the current path is the same for either configuration. Failure/Safety modes is totally a different story.

Electrically, disconnecting the current path is the same for either configuration. Failure/Safety modes is totally a different story.

So you have a house battery connected to all your accessories. How is it connected to the starter battery or motor? 10" from house battery, there should be circuit protection, what size is it?

ABYC says + Also (-) switch disconnect, in a few failure modes, would not disconnect anything.

First follow the instructions manual. Attached is some excerpts from A-31, that may be of intrest.

Had to search my oweners manual, but I guess it will only help charge the aux battery if lights are on or the tow/haul button is pressed.

Doesn't really apply to my boat, just didn't realize my truck had it. My vehicle calls it battery load management. Smart alternator, are designed to be variable output and are controlled by the vehicle computer. Basically designed to improve gas millage and this system may not charge any...

This was an old post of a schematic, pretty good detail, with a parts listiig...

Aluminum is no issue, my steering console is aluminum and gets it ground throuh metal to metal contact. Grounding/bonding is no issue either, your just not alowed to use hull as a return path.

BLUF: So for me, can't answer the original question until all lithium batteries achieve better recycling process. Lifepo4 batteries have many good qualities as discussed in this thread. Lead acid batteries are almost 100% recycleable, not sure about lithium. I know it is quite a process to...

Not enough info for risk assesment, but not just a fuse, but equipment failure when you need it. Stranded, arc near flamabale vapors, lights at dust, just depends on what is connected to the branch circuit.

Pretty sure these units can be connected to each other over wifi and share data. May save some additional wiring. The LED lights, some states reserve blue for law enforcement and they can not interfere/be confused with navigation lights, check your local requirements.

My Garmin Striker 4 doesn't come/use maps. Don't need them for an inexpensive 2D sonar. But my Garmin Echo Map has this statement on maps.

I would do some additional research, the cone size is not the only item to be concerned with. Research and see if it is compatible with side scan and down image. Pretty sure he transducer is only 2D (83khz & 200khz), then any modern FF will be an extremely overpriced addition. Attached garmin...

There are some pretty nice smart battery boxes. Just would have to mae sure they meet your needs.

Same answer, if the wire between battery/power source and fuse panel is longer than 7" a fuse or circuit breaker is required. Wiring, contacts, terminals need to be rated for the max load. If the power wire is in a conduit or sheethed, and > 72" it requires the same as above. Can't speak for...

Master breaker ? Current potection should be used on wiring over 7" long. Cranking circuits are excempt. Wires that are sheethed or in conduits can be 72" long before protection is reqired. Protection should be as close to battery as possible. There are additional exceptions, but they...

Yes, that type of switch. Just want to mention, the switch may not be required, see the attachment. But if you do install it, it should be as close to battery as possible.