(NOOB) new 48v lifepo4 will not charge

Wow... Well.. I put another fuse into the charger, took me forever to find a 3 amp fuse, I plugged it into the wall and BLAMO spark zap! Then.. there was sadness... And bad smells. I opened it up and the wires were black and charred. I suppose the plug which goes into the wall is reversed. Looks like its no use putting another fuse into it, at least with my circit board knowledge. If anyone would like this charger I'll give it to you for free, - shipping. If you can fix it bravo for you.
 
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