I'm attempting to use a pulse width modulation control unit to operate windshield wipers on an old automobile. The little package unit I purchase works fine on the bench but because the PWM power input ground and the wiper motor ground cannot be separated on the car, the grounds are commoned and the unit will not control speed.
Any advice on a way to get around this? Do I need to build an isolated 12DC to 12DC power supply? If so, can someone suggest a DC-DC converter that would handle the 3 amp load. I haven't had much luck.
Thanks - Walt
Any advice on a way to get around this? Do I need to build an isolated 12DC to 12DC power supply? If so, can someone suggest a DC-DC converter that would handle the 3 amp load. I haven't had much luck.
Thanks - Walt