Hiding a Ford Regulator in an Alternator Equipped Citroen D’s and SM’s
By Mark L. Bardenwerper, Sr.
January 3, 2007
Many of us have replaced the Ducellier voltage regulators on our alternator equipped Citroen D and SM models
with electronic Ford regulators. The original voltage regulators have long ago passed their life expectancy and
new ones are very difficult to find. Lights flicker and change intensity with shortened bulb life. Our batteries
risk damage from overcharging. In 1985, John Titus wrote the definitive article on this subject in the
Hollywood, California Citroen Club newsletter. In it he described how to install an electronic Ford voltage
regulator such as NAPA part #MPEVR440SB to stabilize system voltage. Figure 1, from that article, shows the
electrical circuit for the original system. Figure 2 shows the Ford regulator in place. This system works well.
However, it uses a different method of controlling the charge indicator light. Instead of using a relay to
disconnect the ground for the charge indicator lamp, it uses a current differential. This can cause charge light
flicker.
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