First drawing from John Titus article showing the original circuitry used on alternator equipped
D’s. SM’s should be similar. Besides controlling the charge indicator, the starter switch ground is
attached to the L terminal of the regulator. When the engine is running, the points open, turning
off the charge light and disabling the starter.
This same relay also disables the starter after the engine is running on some cars. The starter inhibitor feature
must be bypassed in order to use the Ford regulator unless an extra relay is installed. To restore this function,
Citroen owner and electronics expert Don Bennett has successfully added a relay and a resistor. I decided to go
this one better and use the existing relay, which is already voltage matched to the system. This would not only
make it unnecessary to modify the starter wiring, but it would also retain the original charge light function. I
also didn’t want to see an ugly, squat, silver Ford regulator where the tall black original once was. With a little
measuring, I decided that it might be possible to hide the Ford voltage regulator inside the existing regulator and
retain all of the original functions, with no further modifications.
Free Hiding a Ford Regulator in a Citroen D PDF Download
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