Blue Sea Systems DC Outlet Installations

Blue Sea Systems Dual USB DC Outlet Mod - Truck Camper Adventure

In today’s electronic age you can never have enough USB charging ports and electrical outlets in your RV. This is especially true for those of us who work while on the road. My office is actually located at home, but when I travel or I’m on vacation, I often take my work with me. Such was the case last month when I took a combined business and vacation trip to Salt Lake City and southern Utah in the truck camper. With all the laptops, iPads, and iPhones we brought along with us, a single 110 volt AC outlet didn’t come close to supplying all of our power needs. More was needed.

Most of the electronic devices we use recharge using USB ports. At home we use the little USB Dock Chargers that came with our iPhones and iPads, but each takes up a single AC outlet. Making matters worse, when we’re camping off-the-grid, which is most of the time, we have only one 110 volt AC outlet (this runs off of our 300 watt Morningstar pure sine wave inverter). Using the USB Dock Chargers filled up this outlet, so during the trip we picked up an AC outlet adapter equipped with three AC outlets and two USB ports for $15. This was a big help for us on this business trip, but more USB charging ports were still needed.

Blue Sea Systems Dual USB DC Outlet Mod - Truck Camper Adventure
This 110v AC device provides additional outlets.

Fortunately, I had recently ordered several DC outlets and USB charging ports from Blue Sea Systems. This shipment included what Blue Sea calls a “1478 360 Panel,” a modular, integrated unit that has a 12 volt outlet on one side and a dual USB charging port on the other. Yes, Blue Sea’s stuff is spendy, but their products are extremely well made, have a lifetime warranty, and have higher than normal operating specs. For instance, most 12 volt outlets on the market are rated for 5 amps, but Blue Sea’s marine quality outlets are rated for a whopping 15 amps (each USB port has a rated output of 2.1 amps). A great feature about this Blue Sea panel is that the components are removable and interchangeable. If you want another dual USB charging port all you have to do is remove the 12 volt outlet and install a USB port instead.

Installing the panel itself wasn’t too difficult, though a little planning was required. The most difficult part was looking for a suitable location that could easily be reached and had access to 12 volt wiring. A low point in the dinette area was the obvious place to mount this panel, but no 12 volt wiring existed where we wanted to put it. Fortunately, the large dinette cubby already had a hole drilled in the floor to pass 110 volt AC Romex, so I wouldn’t need to drill another one. All I’d need to do was pass two new 12 volt wires through the existing hole and fish the wire in the void between the floor underneath and the fresh water tank. It sounds difficult, but it wasn’t too bad with the help of a mirror, flashlight, and a clothes hanger fashioned into a large hook to grab hold of the two wires.

Before running the wires underneath the floor, I first had to prep them for connecting to the panel. Unlike most 12 volt outlets and ports, the Blue Sea panel has four electrical blade connections on the backside, two positive and two negative. Rather than run four sets of separate wires, I decided to run two heavy 12-gauge wires and splice two short wires into these main wires. I spliced the wires by stripping 1/2-inch of insulation, creating a small gap in the copper strands, inserting another wire into the gap, then twisting the wires together. To make the T-shaped splices permanent I soldered them then wrapped the soldered joint with insulation tape (I prefer shrink tube insulation for soldered connections, but I still haven’t figured out a good way to do it for T-shaped soldered joints).

Blue Sea Systems Dual USB DC Outlet Mod - Truck Camper Adventure
View of the wires I pulled apart to provide a stronger solder joint.
Blue Sea Systems Dual USB DC Outlet Mod - Truck Camper Adventure
Completed wiring with quick disconnects.

Installing the panel itself was pretty easy. The installation kit comes with a template that makes cutting the panel cutout easy. The panel wood is pretty thin and didn’t take much effort to cut a good sized hole with the small hand saw I used. The black aluminum panel looks great with the plastic framing on the top and bottom which covers the mounting screws. The photos below show the front and backside of the mounted panel. Note that the 12 volt wiring behind the panel is now covered with black conduit to further protect the wires.

Blue Sea Systems Dual USB DC Outlet Mod - Truck Camper Adventure
Wiring behind the panel.
Blue Sea Systems Dual USB DC Outlet Mod - Truck Camper Adventure
Faceplate of the Blue Sea Systems 360 Panel.
Blue Sea Systems Dual USB DC Outlet Mod - Truck Camper Adventure
Location of the Blue Sea Systems Dual Panel on the dinette.

Fortunately, the 12 volt fuse panel was located nearby and had two open slots for expansion. Since I used 12 gauge wire for this project I protected the circuit with a 20 amp fuse. Like I said earlier, the maximum output ratings for the panel are 15 amps for the outlet and 2.1 amps for each USB port, so the 20 amp fuse gives me a little room to play with. As for the 12 volt negative wire, I simply tapped into the negative fuse block near the power converter. And for those who are curious, I ordered this panel through for $42.

After installing the 360 Panel, I turned my attention to the 12 volt outlet I installed a couple years ago in the dinette area. This outlet worked fine, but with the 360 Panel now installed nearby, I had no need for two DC outlets practically next to each other, so I swapped out the outlet for a Blue Sea dual USB Charger Socket. If you think that this charging socket looks familiar, you’re right. It’s identical to the one found in the 360 Panel.

Installing this dual USB charging socket was easy with the wiring previously run, but there were a few small challenges. First, the paneling there was very thin with nothing really substantial to screw into. So I mounted a piece of thin wood there with the required hole to pass the outlet through. With this piece of wood in place the screws and outlet had something to bite into. The outlet is now rock solid. Devising a solution for the last obstacle was simple, but was more difficult to execute. The connections for the outlet are a good 1/2-inch long and with the outlet mounted would extend past the bottom of the storage cabinet. The obvious solution was to bend these connections, but these are brittle and can be broken if you’re not careful. Fortunately, I was able to do this without breaking them and I was able to make the two connections with no problems.

Blue Sea Systems Dual USB DC Outlet Mod - Truck Camper Adventure
Dinette void showing wiring run.
Blue Sea Systems Dual USB DC Outlet Mod - Truck Camper Adventure
New USB charging socket in the dinette area.

Lastly, a dual USB charging socket was also needed in the cabover area so we could charge our cell phones while we slept. The perfect location was the passenger side nightstand, but with no 12 volt wiring there I needed to tap into a 12 volt source nearby. After exploring several options, I decided to tap into the bedside reading light fixture on the driver side. This was the closest location, and fortunately, the best option because this location turned out to be where the 12 volt junction box for the entire cabover was located.

Running the 12 volt wiring from the junction box to the other side of the bed proved to be the biggest headache. Placing the wires behind the wall like the existing 110 volt AC wires was preferable, but there was no way do it with the camper assembled. The only real option I had was to run the wires along the bottom of the headboard beneath the mattress. This I did protecting the wires with small 1/2-inch conduit.

New Blue Sea Systems USB Charge Port - Truck Camper Adventure
New USB charging socket on the side of the nightstand.

Mounting the new USB charging socket was the easiest part of the project. I used a small hole saw attached to my Ryobi to cut the circular hole into the side of the nightstand for the mount. The hole size turned out to be absolutely perfect. The mounted USB charging port looks pretty professional if I do say so myself. Like the 360 Panel wiring, I used female quick disconnects to attach the positive and negative wires to the backside of the charging port. Now we have a bedside location where we can charge our phones while we sleep.

About Mello Mike 908 Articles
Mello Mike is an Arizona native, author, and the founder of Truck Camper Adventure. He's been RV'ing since 2002, is a certified RVIA Level 1 RV Technician, and has restored several Airstream travel trailers. A communications expert and licensed ham radio operator (KK7TCA), he retired from the U.S. Navy in 2004 as a CWO3 after 24 years, holds a BS degree, and now runs Truck Camper Adventure full-time. He also does some RV consulting, repairs, and inspections on the side. He currently rolls in a 4WD Ram 3500 outfitted with a SherpTek truck bed with a Bundutec Roadrunner mounted on top.


  1. I need a couple more 12V outlets in The Palms, too. I think I'm going to have Brian – the man who installed my solar panel tilts – install them at Quartzsite this year. He seems to know what he's doing, and said he would put them in for me. We'll see how much $$$ it will cost. I definitely need more than one in the cabin, too. Your install looks really nice – very clean. 🙂

    Boy, the "robot" words to type in are getting really hard to read – blurry and tilty. Have you considered talking that off your blog comments? For a while they were numbers, very easy to read and type, but I'm noticing all the blogs requiring that are hard to read. Blogger must have made a change. 🙁

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