Pick-up Coil
- Connect test stand vacuum source to vacuum advance unit. If vacuum advance unit is inoperative, replace unit. Connect ohmmeter at position "A". See Fig. 4.
Set on middle scale of meter. Operate vacuum advance through range. Reading should be infinite at all times. If not, replace pick-up coil.
- Connect ohmmeter at position "B". See Fig. 4.
Again use middle scale. Operate vacuum advance through range. Ohmmeter should read 500-1500 ohms in all advance positions. If readings are not as specified, replace pick-up coil.
Courtesy of GENERAL MOTORS COMPANY