Mech fan delete SNAFU- 10a relay fuse already used?

So, I'm following the Mechanical fan delete sticky and I have run into a problem I have not seen referenced. First- car details:

'94 Buick wagon, LT1 with original mechanical primary fan, electric secondary. Bought from original owner, old man who had all maintenance done at the dealership where he bought the car new in 1994. Have not found a single part of the car that was modified from original except the aftermarket CD changer he had added. I am 100% certain none of the fan wiring has been modded previously.

The 40a primary fan fuse slot was empty, as was the relay spot. No outgoing wires in the box under either. Pin hole 11 in the red wiring harness of the PM was also unused. So I installed all of those as mentioned in the sticky. However, the slot marked "primary cooling fan" for the small 10a relay fuse has a fuse in it. The outgoing wire underneath is brown (as it should be for an electric fan according to the Hayes wiring diagram) but instead of going to the empty relay spot it goes into the wiring harness headed for the passenger compartment. I have no idea what it goes to, cannot find any other posts about others running into this, and I'm stumped. I'm afraid to cut it and re-route it because it probably is doing SOMETHING, but my other option is to just add an inline fuse in the 14ga wire and just run it to some source wire that is hot when the ignition is in run. Unless I can run it off of the always-hot wire coming into the fuse box. Any thoughts?

You might try pulling the fuse and see what stops working.

Rev Bob wrote:

You might try pulling the fuse and see what stops working.

The car has been parked for a few years waiting on a stroker engine build and there are a lot of things unplugged at the moment. Also a lot of new wiring changes such as a camaro gauge cluster and conversion from auto trans to T56. I don't have confidence in my ability to diagnose by hooking up the battery and running random fuse tests, especially before lighting the motor off and doing the break-in run. Which, of course, I am afraid to do without both fans functional due to the possibility of overheating during the cam break-in. This is my conundrum. Perhaps I should just do a temporary wire until the rest is sorted out and then revisit it after the engine runs?