All Except Vanagon

Disconnect ignition control unit plug. Connect voltmeter leads between pins 2 and 4 on control unit plug. See Fig 1. Turn ignition "ON". Battery voltage should be present. If not, check wiring circuit for breaks.

Fig 1: Voltmeter Hookup for Ignition Control Unit Operation Check on All Models Except Vanagon
Courtesy of NOT AVAILABLE
Turn ignition switch "OFF" and reconnect ignition control unit plug. Disconnect distributor connector plug. Connect the positive lead of voltmeter to terminal 15 of coil and the negative lead to terminal 1 of coil. See Fig 2.

Fig 2: Voltmeter Hookup for Ignition Control Unit Operation Check at Ignition Coil on All Models Except Vanagon
Courtesy of NOT AVAILABLE
Turn ignition switch "ON". Voltage reading should be a minimum of 2 volts. Voltage reading should last for 1 to 2 seconds and then drop to zero volts.
Briefly ground the center pin on the distributor connector. Voltage reading should increase briefly to 5-6 volts. Turn ignition switch "OFF".
Connect voltmeter terminals to outer pins of distributor plug connector. Turn ignition switch "ON". Voltage reading should be a minimum of 5 volts. If ignition control unit does not perform as specified, check wiring circuit for broken wires. If wires are not broken, replace ignition control unit.