I have a 1999 mitsubishi diamante and I turn on the heat or the. AC and I get nothing from the blower motor I checked every fuse I also ran the blower motor direct and it works perfect and while it was out the blower I checked at the wires and connections and made sure they were plugged in the ground seems good the heater control on the dash is digital but works fine it beeps and shows what the temp is but I went threw all the channels to see what could be my problem and still no blower motor I know there is a relay so I check it and how I did that was I took another one from something that works in the car and swaped it with the blower motor relay because they were the same relay same number prongs etc but nothing so does anyone no wat I'm doing wrong please I'm about to burn this car and make s'mores on the hood lol
Check the Resistor unit.
This stops the blowers working ,
sometime number 1 on the heater switch will but nothing else .
No 2/3/4 working on heater switch.
Pic of the Ford type attached. 
SOURCE: HEAT/AC blower motor stopped working
It's even odd that you were getting a step-type voltage when you first checked.
Many speed regulators are simple tapped resistors with the switch selecting which tap is connected to the motor.
More elegant controls would use a semiconductor (transistor) and a few other components to supply step-variable voltage to the motor.
To determine which is used on your car, you will at least need the electrical diagram for it, preferably an aftermarket service manual - Haynes or Chilton should be available at least in the US and Canada.
Those will contain not only the electrical info you now lack but possibly instructions that will aid in locating the controlling circuit.
I suspect that circuit is faulty; if the resistor type, it will be a device with mulitple taps, if solid state, a few parts on a small board.
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