Hi StarTech,
It never fails... Late in the evening and running empty on 20A fuses.... and the parts stores are closed. LOL (Parts stores think that fuses are gold anyway) $12.99+ tax at AutoZone for a 10 pack (if they have them).
I quit buying bulk box sets of fuses online because many of them turned out to be defective due to poor quality.
Over the years I've gathered a small collection/ assortment of plug-in "metal body" automotive power window and power seat circuit breakers. (Thermal, self-resetting) I would look for them whenever I would go to a salvage yard. Those things have saved me a lot of blown fuse headaches. I even have a couple from back in the "glass fuse" days. For the ones that are made with threaded studs, I attach short leads with male spade terminals to them so I can plug them in instead of a regular fuse.
For some wiring short problems, I use an old school short circuit finder with a basic directional compass. (From back in my early automotive technician days)
A lot of folks with money just laying around just go out and buy a "power probe" with a resettable circuit breaker built in. I learned years ago to work with what I have and quit buying every overpriced tool that hit the market. I do have a basic power probe but seldom use it except for large farm tractor work, the 20ft lead is nice for large equipment, but a pain when working on a rider or zero turn.