I have a 30+ year old Model Power dc controller and the throttle jumps from 0vdc to 16vdc with no in between voltage. I tried hooking it up to a PWM to control motor speeds using my controller as a dc transformer only. The output on the transformer is 16vdc, but as soon as I hook it up to the power inputs on the PWM, the transformer output jumps to 24vdc. I realize it can be difficult to read the PWM motor lead output without an oscilloscope, but I'm wondering why the voltage jumps up to 24vdc on the transformer. The PWM has no other source of power and should act only as a "volume" control, and the output (motor terminals) should never exceed the power input voltage. Am I missing something?