That would be most helpful and appreciated!
OK, I rewrote the connections to do exactly what you wanted.
This way you can use the fog lights with both low and high beam headlights.
BTW on the USDM FiST, the low beams do stay on when the high beam are turned on (at least my car does).
It is actually very easy.
Just buy a Ford relay just like the current fog light relay.
You can use terminal connectors but it fits better if you just solder wires to the inside of the relay.
This way everything fits in the relay/fuse block next to the battery.
Remove the relay's plastic cover, it just pops off.
Connect wires to terminals #1, #2, #3, & #5.
If you connect to the inside of this relay you can drill a hole in the plastic top and run the wires out the top.
This will allow you to place the relay into an unused socket with no connections. (Space for R12)
The relay will just sit there and the box cover will keep it from jumping out.
On the new relay, connect terminal #1 to terminal #5 of the high beam relay (R10).
On the new relay, connect terminal #2 to terminal #5 of the headlight switch (GY-VT wire) inside the car.
On the new relay, connect terminal #3 to terminal #2 of the car's fog light relay (R11).
On the new relay, connect terminal #5 to ground.
The new relay will energize only when both the fog and high beam switches are on.
It in turn will energize the fog light relay.
The fog light switch will continue to function normally with the low beams, parking lights, and auto lamps.
Dave