Headlight Fuse Panel Surprise

[Superman]

I'm installing relays and I HAVE to understand how these circuits work before I can understand what I am doing here. In the pic, the four white fuses on the left are for the headlights. Since there are four of them, I assumed each fuse runs one filament. From left: Left High - Right High - Left Low - Right Low.

However, as you can see, nothing is coming into the top of the Right High fuse. Further experimentation reveals that if I disconnect all wires coming into the tops of these fuses, and then energize each fuse separately, whenever either of the low beam fuses is energized, both low beam lights come on. Similarly, whenever either of the high beam fuses are energized, both high beams come on.

This suggests the two low beam wires are connected between the fuse panel and the had lamps, and the two high beams are also connected between the fuse panel and the lamps. It also suggests that if any low beam fuse blows, both low beams will stay on. And if any high beam fuse blows, both high beams will stay on.

I must be missing something here.

[Superman]

Wait a minute. The pairs (one pair of lows, one pair of highs) are not connected after the fuse panel. They are connected inside the fuse panel. This is why the Right High fuse block needs no incoming conductor. I think I have it now.

[timmy2]

Top row inputs for high and low are joined together on the back of the fuse panel.

[Jonny H]

^ what he said. Lower outputs are not joined.