Jason Roehl in Lafayette, IN
Bill, I would wire in an automotive relay. It will have 4 terminals, labeled 30, 85, 86, 87. 85 and 86 are the coil terminals that close a switch between 30 and 87. So you would T-tap a wire into your high beams, and hook that to 86. 85 gets connected to chassis ground. 30 would then go to a 12V source (preferably fused), and 87 would go to the new driving lights, which would need to be connected to chassis ground to complete the circuit. Optionally, you could install a switch inline between the high beams and the relay so that you could control whether they come on with the high beams automatically or not.

Summary:

30 - 12V fused source
85 - chassis ground
86 - high beam (+) wire
87 - driving lights (+) wire

Jason