I know what you mean Ali - 74 was the first year of the "no seat belt - no
start" US safety rule, and Triumph solved it with the seatbelt module
mounted on the inside passenger bulkhead. On mine, I think the DPO bypassed
it and by looking at the Masters diagram I think I see how.
On a 74, the White/Red-trace wire from the started switch that normally
engages the starter solenoid instead goes to the seatbelt module "brain"
(SMB). Instead of putting 12 volts to the starter solenoid, you are only
asking it permission to start. The White/Orange-trace wire goes from the
SMB to the starter relay (engine compartment by fusebox), where in theory,
power closes the relay to send 12V to the starter. I believe if the
White/Red wire was jumpered into the White/Orange wire that goes to the
starter relay, the SMB would have no say in the starting sequence.
I just looked the circuit and I can't see where the DPO jumpered it (I
would thing that connecting Terminal 11 to Terminal 12 at the SMB plug would
do it). Since I didn't actually bypass the system, maybe there is someone
who has. Cheers.
Jeff
74 CF13816U
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