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It could be the stalk switch or it could be the motor itself. When you switch from normal to high speed, it switches power from one brush to a second brush in the motor.
Frankly, the easiest test is to borrow a known good switch and sub it. You don't even have to screw it down -- simply plug the harness to it. This diagnostic should take only a few moments.
If you go shopping at the boneyard for a switch, remember that you need one for a 245.
Regarding the rear wiper, did you include a ground wire along with the new harness?
Probe around in the tailgate with a test light or voltmeter and confirm that the motor has 12 volts at it when the key is on and that a second tab has 12 volts present when the wiper switch is turned on.
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Don Foster (near Cape Cod, MA)
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