I've done the same 'all on' harness on s10's.
I added a light bar to my rv instead of messing with the 5 or 10v backwash voltage and computer crap I might have ran into with the '4 lights on' dongle.
What is happening is the way headlights work, almost always.
Except for older 5 inch round headlight cars and some of the early 4 small square lights I think what you are describing has been standard for many many years.
The hidden light bar wiring instructions is somewhere in my signature thread.
Splitters are available on ebay. You'll need to know h9 from h11 etc.
You will also notice your fog lights won't come on with your bright lights and your(mine) running lights won't come on with your dims.
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