Ok, Dual Battery setup!
Got the kit from 12voltguy.com
Overall, very impressed with the kit. Very well put together, wires labeled, nice craftsmanship on the panel.
Even included hex head screws and nut serts with an install tool to mount the panel.
The Instructions aren't' impressive at all, but the wires are labeled well enough to be able to figure it out. The instructions seem to tell why he wired it the way he did, and how it works, rather than how to hook it up. Oh well.
Here's the kit:
I already had the factory 2nd battery tray that i added, so all i needed to install it was a 2nd neg cable, and battery post clamps. Ended up getting a 2gauge neg cable (53 in, way too long) and marine terminals from walmart for less than $20. Hard to beat that!
Here's the panel with the bicolor LED, there wasn't a pic on his website:
The kit is basically a switch, LED, and large relay to connect/disconnect the 2 batteries. But for $140ish, it was worth it to me to have a nice setup instead of piecing it together myself. I ran the long red cable from the stock battery, under the bottom of the core support, and up the other side. The length of this cable limited where i coudl put the relay, but ended up being really pleased with where i put it. I mounted it low on the core support, right beside the radiator. Its a little lower than i wanted it, but i had an elec. panel for the light relay mod above it, and didnt' want to rewire it.
Here you can see the bolt heads under the grill. I ended up painting the heads, but they lie directly behind the main cross piece, so you'd never see them anyways.
2nd battery in a stock tray from a diesel:
Next dilemma was where to put the control panel. As you know, my interior appears stock, so i didn't want to change that. Didn't want to wire to the console, and already have used the ash tray panel (see below). Ended up making a custom switch panel thing for the glove box.
My first try was for a small metal bracket, but it ended up fitting wierd, and there wasn't enough room for the mounting screws. Plus, i was going to have to glue it down. Guess i'm not that good at metal fab. Here is the design i scrapped.
After fighting with the metal, is started looking for some sort of bend plastic i could easily attach in the glove box.
I started with this clear organizer box that came from some harbor freight heat shrink tubing:
Started modifying:
Used the lid to make a side cover, attached with hot glue (classy, i know

)
I didn't feel like trying to paint plastic, so i covered the side panel with electrical tape, and put some textured black plastic over the front. Actually impressed with how it came out. Yes, the tape is ghetto, but its in the glovebox, does the job, and ITS A TRUCK. Haha.
Finished product, with switch plate mounted:
Back:
I mounted it in the glovebox with 2 screws from the outside in the side, and 1 through the top. I made it wide enough to fit the switch panel, but narrow enough that the manual still fits in the glovebox.
Each battery connects to a main termal on the relay, then a trigger wire from the switch and a ground also connect to the relay.
A 2nd battery wire and the trigger go inside to the switch panel, which also gets connected to an ign wire (must be hot during cranking too), and a ground.
Overall, happy with the product, and with the install. In Normal mode, the green LED lights, and the batteries are disconnected unless the ignition is on. This means when the key is on, and the truck is running, both batteries are being charged. Center is off, which allows it to work like stock (no 2nd battery), and emergency mode connects the 2 together to jump start a totally dead battery. What is cool is that if you drain down your main battery with the stereo, etc, you don't even have to hit the switch to start the truck, it automatically connects the 2 batteries when you turn the key to start it.
Only think i really don't like is that the normal mode green LED stays on all the time. Not large enough of a draw on the 2nd battery to matter, but still, i would have preferred that it was only on with the ignition.
Overall, glad i purchased it, spent more time than i wanted to making a switch location, but oh well. Can't wait to try it out!
Thanks for reading!