I am about to buy 4 Hella 500 Black Magic Lights w/ a Smittybilt Light Bar. I have experience in wiring but before I wire them I want to make sure it is right.
First here is a picture of what I want to set up

The four lights on the front labeled 1-4 and I want 3 switches (S1-S3). I want S1 to power lights 1 and 4, but only when my brights are on. I want S2 to power 1 and 4 also, but if this switch is on I want to lights to be on regardless if the truck is turned off. And S3 to power lights 2 and 3 same as S2 whether truck is on or not.
Here is what I came up with please let me know if this is right.

 

hmmm, can you tell I like your style?

Honestly, I wouldn't bother wiring to the brights. I like knowing I can turn all 4 on whether the headlights are on or not. Wire them to your accessories or battery. Also, you should think about getting some HIDs for them. You can only fit H3C HID bulbs FYI. I went with 5000K...it's CRAZY bright at night.

I mounted my switches here. I wanted black subtle switches so I bought some from radioshack and didn't use the ones that came with the lights. Currently I have all 4 on one switch, the other switch is for my reverse lights (which are also wired to the reverse lights)

If you have any questions along the way let me know...I just installed mine like 3 weeks ago and went back and converted them to HIDs 2 weeks ago.

 

Well switches 2 and 3 can turn all 4 on with the headlights off I just wanted switch 1 so if I choose to run lights 1 and 4 while driving I don't have to hit another switch to turn it off when someone comes around the corner. I can just switch to low beams and then when they pass I can switch back on with the highs.

For the bulbs I'm gonna keep the 50w in lights 1 and 4 and put 100w (or HID but most likely not) in lights 2 and 3.

And yeah I got the idea from your mod page

 

Looking at your diagram, I think S1 will be always powered because it is spliced into the power from the relay for S1 and S2. So adding power from the brights wouldn't really matter because the relay is always powering it.

 

hmm yep so I'm guessing a third relay wired the same

 

And these switches (the blue led ones)
http://www.oznium.com/rocker-switch

 

Your brights switch needs to be independent from any other power source, unless you want another switch to turn the power off for the battery powered relay to S1

 

How about this one

 

wait the first should work because the relay wont be turned on unless there is power from the brights wire or from the 12V+ from S2

 

You would need a switch to power off the power to the relay for S1 and wire the power from the brights to the relay too. You need a switch for the 12+ lead from the relay for S1