I think the relay cost me $32.00 at my local Ford dealer, Take off the fuse box cover from under the hood, pop out the little brass bar, plug in the relay, it only goes in one way, put the top back on the fusebox cover and your done. If this mod takes you anywhere near or over 10 minutes, please shut your hood and don't ever open it without supervision again.
Seriously it's a piece of cake to do. It's just a white boxed shape relay, theres no re-wiring or anything like that to do, plug 'em in and drive away.
My cars the one in the back, riding behind Hector's Red SE. (I guess you didn't need the explanation since I have the daytime running lights

.)