No problem.
Just better to post back to the Forum..I get so many PMs that I just can't answer them anymore...I am on too many Forums.
The reason I want you to check that fuse is b/c that is feed for the Starter Interlock system and the Benz fuses have a bad habit of making a poor connection in the holders b/c of their design.. So, you wind up wih an intermittant no crank condition b/c of a poor fuse connection..you can just spin them in their holder , but I just tell guys to change them as a new one usually solves it if that was the cause. If not , then ign sw is next suspect b/c you have already changed out the NSS..

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A Dalton