http://www.planetisuzoo.com/articles.htm/109
The wiring is fairly simple. The "hard" part is getting the wiring to match up with the relay(s) that you use.
The general idea is this:
Wire the 50/50 switch to a 12V fused source and then to a relay. In the normal position that relay connects the TOD clutch to the TOD off switch. (more on that later). The other leg of the relay is connected to 12V positive (again switched). That way when the 50/50 switch is off, the TOD clutch is still connected to the TOD computer via the TOD off switch. When you turn on the 50/50 switch it then connects the TOD clutch to 12V positive (and disconnects the TOD computer, turning on the check TOD light).
The TOD off switch is connected as others have documented here in the forum. You'll need a resistor to connect to the TOD computer when you disconnect the TOD clutch. That way the check TOD light doesn't turn on.
The only real addition that I've made is to connect that setup to the dash lights. If you disconnect the yellow wire that leads into the TOD display, the TOD display will go dark. For me I used an extra NC contact on my relay to switch that yellow wire (which is ground for those of you who care). That way when I turn off TOD (2wd mode) the TOD display goes dark. With yet another relay I probably could have turned on the rear wheel lights only, but that's more work than it was worth for me. It was just an added bonus that I could turn off the TOD lights with the relay that I had. I also added a light to indicate when 50/50 mode is on. That light is in the gauge cluster and is labelled something like ATP. It was the only unused light spot on the cluster. All I did was put a bulb in it and wire the bulb to the output of the 50/50 switch.
-Tad
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