Location of voltage regulator 1990 Chevy 1500 350?

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The voltage regulator on a 1990 Chevy truck is inside the alternator.
This is for fuel injected:

Removal & Installation
  1. Disconnect the negative battery cable.
  2. Relieve fuel system pressure.
  3. Disconnect the ignition coil.
  4. Remove the upper intake manifold.
  5. Disconnect the vacuum line to the regulator.
  6. Remove the snap ring from the regulator housing.
  7. Place a towel under the regulator to absorb any spilled fuel and remove the pressure regulator from the fuel rail socket.
  8. Remove the pressure regulator from the fuel rail.
  9. Remove the pressure regulator O-ring filter, O-ring backup and O-ring and discard them.

Exploded view of the pressure regulator assembly-MFI systems

To install:
  1. Before installing the O-rings, lubricate them with clean engine oil and install them on the regulator inlet as a complete assembly.
  2. Install the snap ring retainer into the slot on the regulator housing.
  3. Connect the vacuum line to the regulator.
Ensure that the retainer is properly seated in the slot in the regulator housing. Pull on the regulator to make sure that it is properly seated.
  1. Connect the negative battery cable.
  2. Turn the ignition ON for 2 seconds and then turn itOFF for 10 seconds. Again turn the ignition ON and check for leaks.
  3. Install the manifold plenum.
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