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if everything is getting power as it should, but the starter doesn't turn. First thing to check, is to see that you have power at the "S" terminal on the starter, when the key is in the "start" position.
If you have power there, you should hear the solenoid click. If the solenoid clicks, and the starter still doesn't spin, then you have a bad set of contacts inside the starter solenoid. Usually the one on the positive cable terminal is the culprit.
When the starter is off the unit, if you apply power to the B+ terminal, and ground to the - terminal, then jump a wire to the "S" terminal from B+. It should throw the drive out, and start to spin. However, this is a no-load situation. It takes very little actual amperage to spin the starter this way.
Bad contacts can cause a no-spin when under load, because they simply cannot pass enough current to get the job done. Easy way to apply a slight load, is to clamp the starter in a vise, then while it is spinning, lever a block of wood against the pinion gear. That will tell the whole story.
Testing starter problems is pretty basic, it is not really brand specific, and also not really fun when they don't work.