Heater blower problem

I'm sure there is already threads on this but my search didn't come up with anything I have a 93xj I've replaced the blower motor resistor the plug on the control switch as well as the switch itself as soon as I turn the heater on it blows the fuse the wires all look good as insulation goes ftpm what i can see anyway haven't done an ohm check yet because I I need a meter but is there any other connectors or electronic components that could have a short in the circuit is I'm open to ideas I'm running out of time winters on its way in nd

Unplug the blower motor. Turn on switch. If fuse doesn't blow now, you probably need a new blower motor.

Sorry I meant to type in that I have also replaced the blower motor as well

start looking for a wire with cracked or rubbed through insulation, sounds like you have a dead short somewhere.

That's what I was thinking is there a relay somewhere for the motor and If so where is it if its got one there could be either a short In the relay or the connector