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I did it with just a simple relay
get a 40 amp SPST (single pole single throw) relay it will have (4) terminals.
each terminal will have a number molded or printed on the case.
numbers will be 30, 85, 86, 87, and sometimes 87A
# 86 goes to ground
# 85 goes the high beam wire
# 86 goes to 12v+ use a fuse!
# 87 ties into the fog light lamp + wire.
The best part of doin it this way, the fogs come on with the high beams regatrdless if they are turned on or not.
If your vehicle inspections require the fogs to go out when high beams are on just put a swithch or plug in the #86 wire to ground and they will pass inspection.
as with any mod procede at your own risk
2003 F-250 FX4, Ext Cab 6.0 6 speed manual manual t-case