My set up is fairly similar (my circuit breaker, relays and 6 tap bus are on the passenger side like yours), but I'm missing where you have the fuse/breaker on the main winch positive from the battery to the contactor. Are you doing it on the negative through the 3 - Cole Hersee 65A?
The only things connected to the main OEM battery are the vehicle positive and negative terminals (as delivered by Honda) and a newly added single cable connecting the positive post to the "MAIN" side of the TrueAM isolator. That battery is dedicated to starting and running the vehicle only -- no added accessories.
The AUX battery powers every accessory. It has three wires directly connected to the positive post:
- The cable going to the "AUX" side of the isolator
- The main power cable going to the winch contactor
- The main power cable that feeds the Cole Hersee relay
I also tapped off of the live side of the Cole Hersee relay to feed the always-on (unswitched 12v) positive bus bar (red bus bar on the passenger side). That was easier than trying to add a fourth thick cable to the positive post on the AUX battery. The other side of the relay feeds the 12 position fuse box.
The negative post on the AUX battery has two connections:
- The spare OEM frame negative cable (that was originally wrapped up and laying over by the MAIN battery)
- The cable going to the negative bus bar (black) on the driver's side.
Other than the above, everything (that needed 12v positive or negative ground) is connected directly to the positive bus bar (unswitched 12v), negative bus bar or to the key-on (switched 12v) fuse box. After all, that's one of the primary reasons for adding both bus bars and a fuse block - to avoid a Christmas tree of wires and bunch of inline fuses attaching directly to the battery posts/terminals.
In my pictures, it almost looks like the main winch positive cable (with that big black inline fuse box) is connected to the positive post on the MAIN battery ... but it's not. It runs just past that positive terminal to underneath the dash and is connected to the positive post on the AUX battery.
I absolutely don't know, but do you want/need a fuse/breaker between the battery and the winch contactor?
The thick positive winch cable that came with my winch has a fusible link built into it - that's the cable runs from the AUX positive post to the winch contactor. The key-on lead on the contactor is connected to the 12v switched fuse block, so it only commands the contactor to allow power to flow from the battery to the winch if the key is on. That said, if your cable from the positive battery (or bus bar) to the positive lead on the winch contactor does NOT have a fuse or fusible link, you should add one.
PS: I thought about it for a while, but decided to mount my True Isolator in the open spot - the spot you kept open for your next necessity.
Almost did that (like everybody else). Then I decided that I didn't want to be like everybody else. Well, that and my mild CDO - CDO is like OCD, but
the letters are all in the right #$%^ order!