No no...
Unplug blower motor. Touch test light to the blue/white wire of the plug. Turn speed knob to full blast and turn on the key.
If it lights up, plug it back in.
Then take a jumper wire, put it in the plug touching the blue/black wire. Then touch it to a ground, turn key on, knob full blast.
If it does nothing then you need a new blower motor.
Alright I might have grounded to a different spot the first time , i'll try tomorrow in the morning .
Let me get this straight:
1. Put test light into blue/white plug . (or cut/expose wire and touch ?)
2. Speed knob cranked to 4 , then crank key to position on . (I or II ?)
3. If it lights up , connections are fine . (the fuse is good ?)
4. Take jumper wire , put in plug touching blue/black wire . (while blower motor connected ?)
5. Touch it to ground source , crank speed knob to 4 , then turn key to position on (I or II ?)
6. Nothing happens blower motor needs replacement .
Sorry just need a bit of clarification , last time i seen one in use was with my radiator fan to be on when engine cranked on .