you can make one of these easily. go to autozone and get the circuit breakers that look like minifuses (rated 10A, 15, 25, 30, etc)...for the bigger fuses, just get a regular self resetting circuit breaker, solder some wires to each terminal, and on the end of the wires, have a spade terminal or something that'll go into the fuse slot.
i just have a 20A circuit breaker with two old meter leads attached to the terminals, and plug the needles in the fuse box...works fine
next, operate the circuit thats blowing the fuses...it cant blow the circuit breaker...hopefully...and it'll just keep resetting, probably get hot. from there, follow the wiring harness at fuse box with a magnetic compass...when the short is located, the needle will flip the opposite direction
this method costs no more than $10 to get a magnetic compass (not the water-filled one, the cheaper ****** looking compass thats pointing the wrong way is what you want for this), and circuit breakers which can be obtained at a pull-your-own-part junkyard for free, and wires.
Or take some of the circuit breakers at autozone/oreillys that look like minifuses, those work great for this...they have em thatll fit into standard fuseslots as well, and for Maxi fuses and the bigger ones, just make some metal to attach to wires that'll stay in place.
thats ALL the YA809 is, except this doesnt have a stupid continuity light, and doesnt look as cool. this post also pretty much covered directions for YA809...i happen to own one, bought it off snapon man from a box of old junk he was selling for $15. Never use it, i just grab one of my compasses usually