Wayne Parham Messages: 18793 Registered: January 2001
Illuminati (33rd Degree)
Many times, the field coil doubles as a power supply filter coil. In that case, the unit won't power up unless the field coil leads are connected. The field coil usually has DC resistance between 200Ω and 2kΩ, so you probably want a resistor or better yet, a coil in the line.