[Chas]

I do not have the schematic handy... There is a circuit that can test most vibrators as well as cleaning the contacts. FWIR it uses a 120v 25 watt lamp and the AC line. The lamp acts as a ballast to keep the vibrator coil from burning up. If the contacts are burned away, coil open or contacts welded the lamp glows bright or is out. Correct operations is a someone dim bulb...