Hall Sending Unit (Generator) Check

Reconnect the control unit harness connector to control unit. See Fig 1. Pull back rubber boot on connector. Attach voltmeter positive lead to connector terminal 6 and negative lead to terminal 3. Make sure connector is attached securely to control unit.

Fig 1: Voltmeter Hookups for Hall Sending Unit Check
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Turn ignition switch "ON". With trigger wheel shutter outside Hall sending unit air gap, check voltage reading. It should be 0.4 volts or less.
Now turn distributor until trigger wheel shutter is inside Hall sending unit air gap. See inset in Fig 1. Voltmeter reading should increase to 9 volts.
Connect voltmeter leads in same manner to terminals 3 and 5 of control unit. See Fig 2. Turn ignition switch "ON". Voltage should be a minimum of 7.5 volts.

Fig 2: Voltmeter Hookup for Final Hall Sending Unit Check
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If any of the above voltage readings are incorrect, replace the Hall sending unit.