Provide 70% duty 1kHz PWM 12V signal to control line and it will run indefinitely.Well, I was informed by another poster that I needed a signal generator to get the pwm cooling pump to run, so I bought one. The pump spools up, but only runs for 15 seconds. Switching off and on starts the cycle again. I've tried connecting the other 2 wires a variety of ways but no joy. Has anyone figured out these pumps?