2008 H2, DRLs not working, changed bulb, checked fuse

[baldfox]

Originally Posted by HUMTECH

check to see if you actually have power at fuse 26 with a test light, if not the internal relay in the fuse block is bad and will need a new fuse block (under hood fuse block)

Sorry for the late response, I'll check it out.
Forgive the silly question, but do i just hook up both sides of a test light to either end of point 26 where the fuse would be ? If that is indeed the case, do i need the engine running etc ? Funny, years of messing round with wastegates, and turbos, (even rebuilding a warped head on a car) and yet have never really messed around with electrics.... i feel like a duck out of water. If the engine does need to be running, would i need the thing out of park and say into neutral, with sufficient daylight to simulate when the DRLs would be on normally- or am i getting the wrong end of the stick here how relay's work ?

If that is indeed the fault, do you know how painful it is to replace the fuse block ? Is it relatively hassle free, or am i better heading to a GM "Stealer"...