except for the main strip of 4 fuses, each fuse position has one end with a single terminal and the other end has multiple terminals - the single terminal should be the only place you have a 'hot' wire, the other side of the fuse goes to the item powered
as above, the corner upper left your pic is labeled ACC LP, meaning accessory lamps, the single tab is where it gets power - what are the 3 wires you have there [on the other end of the missing fuse]? if one of those is the gray wire from the light sw, the other ones will be hot if and when the lights are on, [you're just using it as a "junction"], so it should be that the gray is on the single terminal and the other 2 [radio and heat control?] are fused, as they aren't now - yes, the gray wire only is hot when the lights are on, and dims with the dash lights which get power from inside the sw
the 2 bi-metal breakers on the headlight sw are for the headlights only, the small fuse is other functions in the switch [tail lites I think[ and is there regardless of any accessories
Bill