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Where is the voltage regulator located on a 1987 Pontiac fiero 2.5 liter?

On a 1987 Pontiac Fiero with the 2.5L engine (the Iron Duke), the voltage regulator isn't a separate component like in some older cars. It's integrated into the alternator. You won't find a standalone voltage regulator to replace; you'll need to replace the entire alternator if it's faulty.