Pick-Up Coil
- Connect vacuum pump to vacuum advance unit. If vacuum unit is inoperative, replace unit. Remove pick-up coil connector Green and White wires) from electronic module. Connect ohmmeter leads to either pick-up coil lead and to distributor housing. See "A" in Fig 1
. Set ohmmeter to middle scale. Operate vacuum advance throughout vacuum range. Reading should be infinite at all times.
Courtesy of GENERAL MOTORS CORP.
- Connect ohmmeter leads to pick-up coil connector terminals. See "B" in Fig 1
. Pick-up coil resistance should be 500-1500 ohms. If resistance is incorrect, replace pick-up coil. If resistance is okay, check for dwell increase from a high to low RPM.