Gas and Oil Home Heating Furnaces - Gas forced air problem

OK, I'm a basic DIYer but know nothing about electrical or many appliances. But the prob I'm having is that my fuse in my furnace keeps blowin' out. Up until a few days ago my A/C and furnace worked great, both within a few years old. BUt all of a sudden neither turned on...no fan or hum from A/C unit...no blower or hum from furnace in the garage. I checked the A/C unit itself (looked inside) and everything seems normal. I check the furnace and everything looks the way it should, but when I check the 15 amp fuse it was blown. So I got a new one and replaced it, as soon as I turned on the thermostat to A/C to cool the house, my wife (who was looking at the fuse while I turned it on) saw it pop. So I tried again with another fuse....same thing, it popped. Like I said I don't know much about electrical, but I seem prety sure there must be a short or overload somewhere. I have no idea where to begin to check it out. Any help would be greatly thanked!

Jason

check all wiring with the supply voltage to the furnace off. look for burnt wires, evidence of smoke, can you spin the fan? if you have a meter, let us know

OK, Thank God it's not winter or I'd freeze to death. I've been w/o a furnace for a week and have finally found time to get back to it. I've talked to guys that know a little more about furnaces than I and had a couple of 'em come over and take a look. So far everybody is pretty much settled that it is the blower. But they haven't ruled out the converter?, (something that sounds like that, I can't remember already..damn what a week!) Nobody hooked up anything to it so it's all just talk from looking at it and checking the wires and such. No I don't have a meter but they're only a few bucks for a simple one, only thing is, is that there are alot of wires, so it'll take time to find the right ones if I have to check anything. (they should be in the manual, right?) BTW, it's a TECH made by Consolidated Industries, downward forced.
Thanx for replying HVAC.
Jason

Try disconnesting the blower motor wires -then turn it on
no blown fuse= bad motor
blown fuse = electric problem somwhere in the circuit