DURA-Spark II With Universal Ignition Module (UIM)

Fig 1: Dura-Spark II System with Universal Ignition Module

Some models have a special electronic control module with a third connector with 3 wires. See Fig 1. This connector attaches to a special switch. The switch is either a distributor vacuum modulator valve or an ignition barometric pressure switch.

This switch allows base engine timing to be modified to suit either altitude or engine load conditions. All other operating characteristics of the module are the same as for Dura-Spark II systems without the special switch.

The UIM can be identified by its third connector and by its Yellow wire grommet on the module.

Fig 2: Dura-Spark II Ignition System Wiring Diagram