Its already a done deal but did you ever consider looking at the OEM Honda installation instructions for the wire harness? It's difficult to know whether you went with OEM or aftermarket wire harness but I think installing the harness the way Honda instructed would have prevented you from cutting wires, which is never a good thing. Anyway, I hope all is good.
Trailer Hitch, Wiring, Seat Back Protectors
Since taking delivery of our PP, I've added a Curt Class III Hitch, a Seven-Pin trailer wire harness, and Seat Back Protectors.
The hitch was a bit challenging to install by myself. I used wood blocks to "crib" a support high enough to get the bolts started. The process reminded my of my CERT training. Before doing anything else I chased the weld nuts to make sure their threads were clear. The hitch went on without a hitch and I'm almost ready to tow a trailer.
Installing the wiring harness was straightforward except for needing to cut all the wires to get them through the grommet in the floor. A bundle of important-looking wires were already there and I didn't want to risk damaging them by cramming the 7-pin plug through the opening they were occupying. Got everything reconnected below and working.
To install the Seat Back Protectors, I purchased the Rotabroach tool set referred to in the installation instructions. I really like how well they cut holes. The bits have a shoulder so the hole depth is controlled. However, drilling the pilot holes has to be done with some care to prevent going too deep. I'm very happy with the result. The Seat Back Protectors do a great job of continuing the floor when the seats are down, continuing the coverage provided by the Cargo Area Tray.
The hitch was a bit challenging to install by myself. I used wood blocks to "crib" a support high enough to get the bolts started. The process reminded my of my CERT training. Before doing anything else I chased the weld nuts to make sure their threads were clear. The hitch went on without a hitch and I'm almost ready to tow a trailer.
Installing the wiring harness was straightforward except for needing to cut all the wires to get them through the grommet in the floor. A bundle of important-looking wires were already there and I didn't want to risk damaging them by cramming the 7-pin plug through the opening they were occupying. Got everything reconnected below and working.
To install the Seat Back Protectors, I purchased the Rotabroach tool set referred to in the installation instructions. I really like how well they cut holes. The bits have a shoulder so the hole depth is controlled. However, drilling the pilot holes has to be done with some care to prevent going too deep. I'm very happy with the result. The Seat Back Protectors do a great job of continuing the floor when the seats are down, continuing the coverage provided by the Cargo Area Tray.
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I installed a Curt harness and studied its installation instructions thoroughly before doing anything. The issue for me was the diameter of the plug that fits into the 7-way socket into which the trailer plug inserts. It was just-- too-- big to fit through the oval hole in the floor, with the existing wiring there. I probably could have used some lubricant and gotten it through, but I didn't want to deal with the residue after. Above all I didn't want to damage anything already there. If it had been a four-way harness, I would have had no problem and would most likely have been able to use a different hole in the floor. I have a good crimping tool and got the wires back together in a functioning manner.Its already a done deal but did you ever consider looking at the OEM Honda installation instructions for the wire harness? It's difficult to know whether you went with OEM or aftermarket wire harness but I think installing the harness the way Honda instructed would have prevented you from cutting wires, which is never a good thing. Anyway, I hope all is good.
I also install a new Curt hitch, wiring, and transmission cooler. I do not anticipate hauling over 3500 lbs, but I like the added production to 5000 lbs.
I had the whole ATF cooler, hitch, harness, and Handsfree done at the dealer. I did the seatback protectors and side cargo protectors myself. The cargo mat was discounted and part of the purchase. My whole rear cargo area is protected and looks pretty cool also. 
Transmission cooler is next on my list of things for the dealer to do. It's very easy to exceed the 3500 lbs. limit, from what I've looked at camping trailer-wise.
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