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Swapping the factory winch from the main battery to the aux battery looks pretty straightforward as only two wires need to be changed.Yeah it's called a sub harness for factory warn winch. It's a mess. Worst case I'll take it to the dealer and say remove all that crap. I want them to remove the factory switch pannel harness kit for the dash aswell I want basic 2 battery. A positive and a negative and I'll wire my aftermarket accessories Just as that, aftermarket. I don't see why they had to be fancy and plug and play all over the harness. Especially when they designed a system that can't even run its own accessories and the trans and ecu all at once withought a second battery. Lol I spent 600$ today buying all the equipment I need and now I need to pay the dealer to strip the machiene to remove their fancy wiring junk lol... Definitely a little annoyed today with this machiene
The winch gets its power from being connected to the starter relay battery post; simply remove it from there and relocate it to the positive of the aux battery. If the original wire isn't long enough, just make a new one.
[I don't know if the winch positive wire is actually a fusible link providing short circuit protection or not. Likewise, I don't know if the wire from the main battery to the starter relay is a fusible link or just a plain wire. You could always insert a breaker between the aux battery and the winch power wire or make the connection using fusible link if you're really concerned.]
The second wire/connection that needs to be dealt with is the winch ground connection. The factory install uses a cable that is preinstalled on all 1000's. The easiest solution is to run a ground wire from the battery negative terminal to the ground post on the winch contactor unit. If you leave the factory ground wire on that terminal, it'll tie your aux battery to the frame ground. If you're putting in a secondary fuse panel for the aux battery, run a ground directly to it from the aux battery as well (presuming it has a negative bus bar for the connected accessories.
A purist might say it's better to wire the aux battery directly to the frame and directly to the winch, but the only really high current item most aux batteries will power is the winch.
From the install directions, the winch "sub-harness" is merely for connecting the remote controller- no need to mess with it when installing an aux battery.
Page 14 and 15 of the install instructions show the positive and negative power connections for the winch contactor: Honda Winch Install Instructions
Here's the install instructions for the Honda switch plate: Honda Switch Plate Installation Instructions
Page 4 shows a wire-tap connector is used to obtain power from the 15A accessory fuse (key on power). No reason to alter it.
Page 5 shows the switch panel power harness is obtaining its primary power for the accessories from the starter relay, just as the winch. Relocate it to the aux battery and anything connected to it will run off of the aux battery.
Page 6 shows the negative wire is connected to the primary battery ground. Move it to the aux battery ground.