Frankenduck,
Is the high relay triggered all the time with the diode installed, or just when you have the high beams on with the switch in the down position?
And, perhaps showing my ignorance even more, why bother with the switch at all. With a solid ground, you'd have the Catz on with the low and the Hella on with the high. Why do you want high beam in daylight and fog except to flash a cage?
Tom