Where is the voltge regulator on a 1989 lincoln town car

VOLTAGE REGULATOR IS LOCATED BEHIND BATTERY.YOU PROBABLY MIGHT HAVE TO REMOVE BATTERY TO REMOVE THE VOLTAGE REGULATOR.

If your town car is a signature series with the heavy duty alternator option, like mine, then you have the 100 amp alternator and EXTERNAL regulator. The 100 Amp alternator is identified by one connector and two bolt on wire connections. The voltage regulator is mounted to the top of the driver side wheel well. The replacement for the regulator is the BWD R400Z

The voltage regulator on that vehicle is integrated with the alternator and is part of the alternator. Some Ford alternators had the voltage regulator assembly with new brushes spring loaded into the voltage regulator and a pin holding the brushes in place until the voltage regulator was installed onto the alternator and then you pulled out the pin holding the brushes and that was all there was to replacing it, and do not remove that pin holding the brushes in place until the voltage regulator has been installed.

Your vehicle might have a serviceable voltage regulator on the rear of the alternator, it will depend on which alternator that Ford used in your vehicle, and you will need tamper resistant torx head bits to remove the screws that secure the voltage regulator to the alternator.

(Some Ford alternators have internal voltage regulators and the voltage regulator is not serviceable)

Be sure that you dis-connect the battery ground or Neg. (-) cable from the battery before you remove the alternator or dis-connect the wiring to the alternator, and do not re-connect the battery ground Neg. (-) cable until you have re-installed the alternator and re-connected the wiring to the alternator.