This just started out of the blue tonight. I tried taking the fuse out and still runs. I unhooked under the hood, going to the blower motor itself, so I thought, and stays running. This is my boys truck and he has to be at work at 6am so I showed him how to take battery cable off when gets to work so it won't kill battery. Any help with this would be very appreciated.
Main suspect is the blower motor relay. What year, make and model of truck will tell you where the relay module is. I have an 86 s10 that does this also. I replaced the 30 year old relay module with a new one, and the new one does it once in a while also. Yes, I swapped the new one for free within the 30 day warranty, and guess what? The other other new one does it too. On my s10, the relay is on the firewall about 6 inches from the blower motor. When the thing won't quit, I pop the hood and tap on the relay to make it stop. 
Must be a dodge
SOURCE: Car is shut off, switch is verified as
check blower motor regulator for moisture and corrosion on connectors
SOURCE: 1995 buick park ave blower motor stays on
Replace your blower motor relay. It's located under the hood on the firewall passenger side.
SOURCE: My heater's blower motor runs even when the car is OFF
You MAY have an "Ignition Switch " thats bad.
SOURCE: 2004 range rover . blower motor continues to run
either the blower motor resistor or blower motor relay! most likey the resistor!
SOURCE: blower stays on when car
If you pulled the 10 amp fuse in the I/P fuse block and the blower still worked than the the blower motor module is most likely the problem. It is fed by a 30 amp fus4e in the fuse block under the rear seat. That fuse is always hot and always supply power to the blower motor module. If you pull that fuse and the blower stops than it's pretty likely the blower module is the problem.
The blower module is located near the blower motor. It is usually held in place with 2 screws and will have four or five wires at the connector.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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