Mike, look at the How-To article I posted a few months ago on how to rebuild a 69 Barracuda 2 speed wiper motor. It includes a detailed description on how to test the motor. Here is a teaser, but read the article. It is pretty detailed. If push comes to shove, send me a PM. MAKE SURE THE WIPER MOTOR HOUSING IS GROUNDED DURING THE TESTING PROCEDURE! Testing the two speed motor is really easy2