Switched to ignition under the hood?

[EfiniX]

Is there an easy place to find a lead that is switched to ignition under the hood? I've got a new radiator in with it, a new thermo switch. The switch is working well enough, but wired directly into the battery means it runs even when the car is off. it doesn't run long, but I'd prefer it didn't run at all.

I know I can pull a wire in from the cabin, but if there's an easier way under the hood, that would be prefered.

 

[EfiniX]

Sorted out. I was rewiring my radiator fans and it dawned on me that I could just use the OEM relay on the fuse block. Done and done.