Greetings:
Paul is correct. And so is Joe. On 73 & 74 non-OD 3 rails there is a
seatbelt/ignition switch activated by an external gearlever shaft cam. On 73
OD models the D-type OD inhibitor switch (mounted on the same bracket but
directly opposite the seatbelt/ignition switch) is activated by the same
shaft, but a different type of cam is fitted so that both switches are
operated depending on the gear lever position. To further complicate
matters, 74 OD's changed to J-types. Most of the seatbelt switches have been
bypassed over the years.
Bill Brockschmidt
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