Originally Posted by cummins6speed
Quick and dirty using relays:
That must be really quick and very, very dirty
No need for 2 relays and it is generally not a good idea to run your power for the accessory through the switch. Many switches aren't meant to handle that kind of power and you want to keep the high power in the engine bay, not running it back and forth through the firewall. While your diagram would technically work if everything was properly rated for the power the light bar requires, I wouldn't go that route, sorry.
Originally Posted by evanmb31
Pugga has this exact setup with the on/off/on switch, and i think he had a diagram
My ears were burning!
^^ From that thread, look at this post
This is a DPDT switch, like I used but it can be done with a SPDT also (basically the single pole, double throw switch will only have one side of this diagram and the switch lights will likely be connected internally a little different). For a SPDT, look at numbers 1, 2 and 3. These switches and the diagrams you find online for them assume you're bringing power in from one spot and then it will be outgoing in the 2 on positions. You will be doing the opposite.
On the diagram above:
Pin 1 would be fused power from the battery (I'll come back to this because you don't want the light bar drawing full power through the switch)
Pin3 3 would be your high beam tap (this does not need to be fused since the high beam circuit is already fuse protected)
Pin 2 is outgoing to your relay
On your relay:
85 - Ground
86 - comes from Pin 2 on the SPDT switch (this is what activates the relay to turn on)
30 - fused battery power. What I would do is take power from the battery, run it through a fuse, then split it. One wire goes to the switch like mentioned above, the other wire goes to pin 30 on the relay. That prevents the light bar from pulling full power through the switch.
87 - outgoing power to the light bar.
At the light bar, the wire coming from 87 is your power in so all you should have left to do is ground the light bar itself.
Obviously, depending on the switch you end up using, you might need to tweak what I wrote above but hopefully you get the idea. Once you decide on a switch, post up the wiring diagram for the internals of that switch and I can tell you what needs to be connected where.