Volkswagen Front Wheel Drive 1974-1989 Repair Guide

Testing

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IGNITION COIL



See Figures 1 and 2

  1. Label and disconnect all wires from the ignition coil.
  2.  
  3. With an ohmmeter, measure between terminals 15 and 1 (primary resistance). Check that the ohmmeter reading is between 1.7-2.1 ohms. If not, replace the coil.
  4.  



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Fig. Fig. 1: Measuring the ignition coil primary resistance

  1. Measure the resistance between terminals 1 and 4 (secondary resistance). The reading should be between 7,000-12,000 ohms. If not, replace the coil.
  2.  



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Fig. Fig. 2: Measuring the ignition coil secondary resistance

BALLAST RESISTOR & RESISTOR WIRE



The ballast resistor was replaced with a resistor wire in 1976. It runs from terminal 15 (+) of the ignition coil to terminal C15 at the back of the fuse block/relay panel. The color of the resistor wire is usually clear with violet stripes.

The old type ballast resistor can also be checked using this method. Before checking, disconnect all wires from the ballast resistor, then measure across the terminals. It should have the same resistance value as those listed for the resistor wire. If not, replace the resistor.

  1. Unplug multi-pin connector C from the fuse/relay panel.
  2.  
  3. Unplug the resistor wire from the ignition coil terminal 15.
  4.  
  5. Connect an ohmmeter to each end of the wire (terminal C15 at the fuse/relay panel).
  6.  
  7. The resistance should be between 0.85-0.95 ohms for the Rabbit, Golf, Jetta and Scirocco and approximately 0.9 ohms for Dasher. If not, replace the wire.
  8.  

 
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