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Typically, there’s a puff of smoke, and you’re stranded. To help prevent this, the Opel GT Ignition Switch can be tested, either in the car (using key to turn) or off the car (using a screwdriver to turn), with a simple ohm meter. Use a common volt-ohm meter, to test the switch in the “start” position.
Connect one test lead to the end of the solid red wire (A) and another to the end of the striped red/black wire (B). (See: “Fusebox View”). Release the switch for a moment. The ohms should revert back to infinity. If it doesn’t (if measurement goes back and forth), the switch may have poor internal circuit isolation, which ndicates carbon buildup or overheated parts. (If so, spray-cleaning may provide a quick-fix). If the ignition switch is verified to be in working condition, the first protective action recommended is to install a protective 4-prong 30 amp relay in the starter circuit. An inexpensive relay will take up the brunt of the current when the starter is powered, keeping it out of your valuable original GT ignition switch.
