OK, the cap I understand, to integrate the PWM waveform. But what's the diode for? To protect the driver transistor from field collapse? I've always seen these in parallel with the coil, not in series. New relays have them built right in. I thought that was sufficient. What am I missing here?
08 4 Door Rubicon
Member of Two Trackers 4wd Club
Great Lakes Four Wheel Drive Association
United Four Wheel Drive Associations