it is possible. I recommend unplugging the trailer lights before giving the boat a dip. That is what I do. Even with an isolator, it is good practice to unplug the lights.
Bingo.
It isolates the truck from the trailer. The trailer will get its power from the dedicated circuit. The individual fuses isolate a fault to an individual switch leg. I have 15 amp fuses in each now.
If the trailer is shorting while driving you will at least have half of the lights and...
Not for the brakes. They come from a controller. Accessory circuit has its own 30 amp fuse.
This could be run off of the accessory circuit or its own 30 amp circuit.
You can buy a similar product. It is only rated for 8 amps and it is solid state. Mine is purely electro-mechanical. I also left space to add a relay and fuse.
Any more guesses? It is for towing. It has a purpose and many benefits. Especially is you tow somebody else's trailer or back a trailer into water and forget to disconnect the lights first.
I don't need a fuse center for this. I have one under the hood. This goes at the end of a 30 amp circuit. This mounts under the back of the truck. The fuses are for providing further isolation.
The relays are 40amp hellas. They are very robust.
But what is it for?
The point of good communication is to be effective and unambiguous. For this reason I choose to stay away from acronyms until everybody settles on what the definitions are. If you have not agreed to your definitions, then all you will ever argue about is definitions.
When someone asks me what...