I have a Victor Engineering 12 Amp Max., 13.8V power supply that I use with my charger. Last weekend I blew a fuse, I picked up some new ones from Radio Shack todaY. I had nothing plugged into the power supply and when I flipped the on button... POOOF that fuse blew as well.
What would cause fuses to blow with nothing plugged into it. I replaced it with a 3amp 250V like it says on the circuitboard. I have a Integy power supply I plugged into the power socket and that works fine. So it is something with the power supply.
there must be an internal short in the power supply,it maybe a little tough to find.since it's the fuse for the AC side of the power supply,I would start by looking at the AC circuitry going into the transformer for anywhere that wires maybe touching.