Wiring up driving lights in highbeam location w/ OEM fog switch...

[area53 at validpath.com (Jeff Toomasson)]

Hi folks - I'm ready to begin wiring up my relayed lights and I plan on 
treating my highbeam location lights as driving lights using an OEM mk1 
fogswtich as the toggle. I assume I can use the inner position highbeam (+) 
wire to trigger the relay, but what I'm trying to figure out is which wire to 
tap for the switch input. I obviously can't use the inner highbeam position 
wire because that will be triggered by the signal stalk and I want the 
function independent of that (duh).

I assume all I need is a low voltage (+) lead, right? Is it as simple as 
tapping into the cig lighter lead? Should I use a fuse in that connection? Any 
other recommendations? 

Any input is appreciated.

Thanks!  Jeff