How do you test an ignition control module on 1987 gmc suburban?

To test the ignition control module on a 1987 GMC Suburban, first, ensure the ignition is off and disconnect the battery. Then, remove the ignition control module from the distributor. You can use a multimeter to check the resistance of the primary and secondary windings, comparing the readings to the manufacturer's specifications. Alternatively, you can take the module to an auto parts store that offers free testing services for ignition modules.