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A short or overload. Get a wiring diagram. Find the circuit. Disconnect items on that circuit one at a time. If all are disconnected and the fuse still blows, you've got a wiring harness issue.
When the fuse blows figure out what you are doing, what switch is being pressed, then remove the needed panels to access the wiring to the switch and motor it operates, then you will find the damaged wiring and repair the short, no quick fix, just hard grunt work.
Most common problem would be the blower fan motor, which has"worn out" and has a short in it. Small maybe is the wiring to the motor, has a short from being pinched or worn in some spot. e-bay might have parts to help you. Remember, used parts can fail anytime.
try another fuse. check that all bulbs work. If fuse blows again in a short time, you have a short in that circuit- a broken wire or wire that lost insulation and is contacting metal. It may or may not be near the bulb you replaced.
you might have a short to ground problem. the circuit is complete from the battery to ground. Check the wire from the fuse to the load, and chances are there's a spot in it where the wire is touching ground.
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