Im not talking about bypassing the fuse I'm planning on residing a new relay in with new wires and a new online fuse it's not going to be dangerous in fact I'll be upgrading to larger wire guage so if anything it will be safer I would never bypass a fuse that was blowing. No wiring was changed it was working fine one day then all of a sudden it start blowing fuses my best guess is somewhere a wire chafed or the relay has an issue of some sort like internaly grounded my plan would fix either

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1984 300D Turbo 169k

"Twenty years from now you will be more disappointed by the things you didn't do than by the ones you did. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover."
-----Mark Twain

You've got the correct fuse number (c) and the proper sized fuse.

If your problem is the relay or a wire that is chafing, the fuse will melt whether the fan is running or not. You can test this by disconnecting the fan at the plug and see if the problem occurs.

My bet is on too much current draw from the fan.............which you can check if you have a suitable ammeter.

Doing all that work to bypass the wiring and the relay doesn't make a whole lot of sense if the problem is within the fan itself.