Auxiliary Electrical Installation, 2
Auxiliary Electrical Installation, 2
Distribution
Running wires throughout the truck is a creative process. Finding the right path is key. I chose to run all the electrical internally, going through the firewall and channeling the wiring to the center console and to the rear of the vehicle. There are a couple opportunities to get through the firewall without creating new holes. I ran several lines through the existing gasket on the drivers side, the lines for the compressor through an existing gasket on passenger side, but the majority of the lines I went through a rubber firewall plug that I cored out and made a grommet out of it. Switch legs and center console power all went through it. Between the live and switched power lines to the center console, the switch legs, seat heater power, roof rack power and compressor, I guess I had 18-20 wires passing through the firewall. Equivalent to the diameter of your index finger. We also had line voltage to the panel, and power to the front lights.
The unique thing about this relay/fuse block is that it is switched power from the auxiliary battery. What I did is ran the line side power to a continuous duty relay, very similar in design to the solenoid used in the National Luna Intelligent Solenoid. It has a power in tap, a power out tap, and taps for switch voltage and ground. A #10 comes from the aux battery to line in, and a #10 from line out to the relay/fuse block. A ground wire for the switch is grounded to the vehicle. The last wire is the switch voltage. When energized, it closed the relay to supply power to the switched fuse/relay block. I hooked this to a circuit that is only on when the car is on.
Wiring up the relay/fuse block wasn't as bad as it looks. I learned all about weather pak electrical termination too. Once you know what wire goes where, it's pretty straight forward. Power from fuse to relay power in, line from switch, and power out to accessory. The relays are grounded in the block. Feed power to the switch, switch feeds relay, relay feeds accessory higher amperage as needed. Plug and play. Here is what the fuse/relay block ended up looking like.
Center Console
I ran a live circuit and a switched circuit to the center console. The live circuit was there to provide power to (2) dual USB ports that I installed on the center console passenger side. We are always running out of these, so we're covered now. I also now have power there for other future components. The switched circuit was there to supply power to the mobile/data amp, the 2 meter radio, and the the switch panel. In preparing for the electrical installation, I needed an elegant solution for inline distribution of power. A way to take one circuit to a location and split it among several duties. Butt splices and termination caps are not as clean as I wanted. I sourced a cool little gizmo made by Wago. It is a re-usable compression wire terminal, rated for 12-300V, and comes in 2 to 5 wire configurations. I bought my 3 conductor terminals through Amazon. Very handy. So I could bring one line in, feed a second one and an accessory, and feed two more accessories with the second one. And I can open them up and interchange wiring as necessary. Perfect solution for vehicle wiring.
Rear of Vehicle
Power to the rear of the vehicle included 2 switched circuits for the roof, a live circuit to the roof, ground to the roof, power to compressor, and power to compressor switch. Several lines were run down each side of the vehicle in the OEM harness chase under the doorwell covers and through the rear side panels. Roof and live circuits on driver side and compressor circuits on passenger side. The first couple times you remove these panels, it takes some time. But after a half dozen times it is pretty quick. You learn where the fasteners are. I ended up running the lines for the compressor straight off the aux battery. The required (2) 40A fuses, and those are larger than the panels can manage. (2) more 40A lines were needed for the live and switched fuse panels.
Roof Rack Electrical
The biggest challenge in the distribution of power in the vehicle is getting power to the roof rack. We needed switched power for the LED Light bar on front, switched power for the rear LEDs, and a live circuit for in-tent LED lighting, and a ground for it all. Four wires to the roof. I looked at several options. I am opposed to drilling unnecessary holes in the roof. Against it, at most any cost. Non-reversible. The windshield offers a small recess on the sides that could work. It did in the 100 Series, but it is quite small and really messes with windshield replacement. The best alternative that I could come up with is to take the power up through the rear hatch chase and navigate it to the roof rack channel. I routed the wiring up through the liner and poked it out a hole I made in the hatch harness chase. I ran the wires through a weather strip bulb with adhesive on one side, transferring to wire loom once on the roof, and sealed the connection with heat shrink. The wire loom recesses in the roof rack rail very well. I brought it up to the rack, and distributed the power 3 ways through weather pack connectors. From here I routed each circuit in loom to each needed location. Is it a perfect installation? Maybe. I think that over time the weather strip may give way, and I will need to come up with a better option. But for now, I will use it and see.
Roof Rack Lights
Now I have a switched circuit to the front LED Bar, a switched circuit to the rear LEDs, and a live circuit going up into the roof top tent for lighting there as well. I channeled the loom through the bottom of the rack, between the top slats and the cross braces, and secured the connections to the bottom of the rack as well.
Conclusion
The addition of the electrical distribution and management was well worth it. It has provided the solutions that were right for my application, and it has created the foundation for future use. I have 6 live and 2 switched circuits in reserve, as well as 3 switches ready to go. Opting for the Bussman fuse/relay block was a good call for me. All in, I spent about $100 on components on it, and I learned a great deal. I really took the time on this system to ensure it was good enough for the long term. And I am satisfied with the outcome. I hope this helps some of you contemplating the same issues. Let me know if I can offer any suggestions along the way. Been there, done this.
Cheers,