So my '86 truck's interior fan just isn't blowing hard.. The first switch isn't working and the rest all work but the air that's coming out is all the same intensity which is light pressure.. I just changed the blower motor and that didn't do anything and now I just replaced the resistor and that didn't improve anything either.... What's next?.. Thanks guys!

 

Try running a wire straight from 12 volts to your resistor, and see if that works.. In my 77 I had a similar issue and ended up just running a new wire to it and it solved the problem.. Good luck!