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As far as the diode, I dont know what that actually does. I had it pulled out, but the bike still started. I took it down to the shop, and they were not sure what it did either. They took a picture of the part and were going to try to get some more info from someone else in the organization. This is the one in the harness near the starter relay, not the one under the tank. For any of you that have the triumph service manual #T3859909 , this appears to be number 15 on pages 16.60 and 16.61.



I think maybe you 're referring to the thermostat switch for the carb heaters...located on the air box under the starter solenoid and not the diode pack in the wiring harness that regulates the starting circuit.

And before you go too far disassembling stuff chasing gremlins what is the condition of your connector between the R/R and the fuse box? That's not the best connector nor the best location and corrosion can easily kill a good ground path.