Mitsubishi Camera retain cabling

There are 2 standard for the retain cable needed for Mitsubishi

If your cable will look like this

and does not work then either
a) run an earth wire from pin No 1 to Pin No 4 and so they are both joined to earth
or
b) even easier - on the other side of the plug simply find the wire which connects to pin 4 and connect the earth from Pin 1 (leaving Pin 1 to still have earth)