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Distributor Pick-Up Coil

  1. Connect external vacuum source to vacuum advance unit. If vacuum advance unit is inoperative, replace unit. To check pick-up coil for shorts, connect ohmmeter leads as shown by meter "A" in Fig 3.
  2. Set on middle scale of meter. Operate vacuum advance through range. Reading should be infinite at all times. If not, replace pick-up coil.
  3. To check pick-up coil resistance, connect ohmmeter leads as shown by meter "B" in Fig 3. Again use the middle scale. Operate vacuum advance through its range. Ohmmeter reading should be 500-1500 ohms in all advance positions. If readings are not as specified, replace pick-up coil.
    Fig 1: HEI Distributor Cap And Coil Testing Connections With Integral Coil
    G09360848Courtesy of GENERAL MOTORS COMPANY

    Be sure leads contact proper connections. 

    Fig 2: Coil Testing Connections With External Coil
    G09360849Courtesy of GENERAL MOTORS COMPANY

    Touch coil mounting screw for ground. 

Fig 3: Distributor Pick-Up Coil Testing Connections
G09360850Courtesy of GENERAL MOTORS COMPANY
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