It's a shame Lik-Sang shut down, they have a huge range of converters for these kind of problems.
I'm guessing you need to step it down even further?
Maybe GC takes more power to run then Wii and that's why the converter won't blow it's fuse for it, possibly try convert it to an even lower voltage, if that option is available (of course you would of already tried that if your step down convert has that option, and hence it wouldn't of worked, resulting in your post, making my response meaningless)
I bought a step down converter for my import DS Lite (Damn converters are expensive)and have never had this problem, but the converter has no option to change it's voltage from default Japanese.
Good luck with that, and damn, I'm a HUGE Harvest Moon fan and would love to hear about that game if you get it working.
If it’s the fuse that keeps blowing the only answer would be to step it down even further, if that doesn’t work there’s something wrong with your house’s power supply, either that or you’ve updated your Wi and perhaps has a patch that disallows such converts which I highly doubt, just looking for all options here!
PAL: 240v and Japan: 110v (or something low like that, pretty sure it's 110v)
