Where is the voltage regulator on a 1984 ford e van 351 4 barrel?

On a 1984 Ford E-Series van with a 351 4-barrel engine, the voltage regulator is part of the alternator. Unlike older vehicles where it was a separate component, Ford integrated the regulator into the alternator in the early to mid-1980s. Therefore, you won't find a separate voltage regulator box. The alternator itself is located on the engine's front, typically driven by a serpentine belt.