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No resistors in a regulator.
It is a transistor switched ground.
So, the test is to ground the blu wire after you know the reg has trigger voltage at yellow wire.
You state you have power at 3 prong connector, but you do not tell us if you have both blower power[ 12v] and reg trigger [ 2-8v]
If motor runs with blu grounded, reg is bad............[ only after confirming reg trigger voltage from PB unit]
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