Hi Cobra 1, I suppose the transistor would work? Did he give you a type of Transistor?
In looking at the wiring diagram, the ignition switch is a 'NO" normally open switch. Closing the switch sends +12 volts from the main fuse via a wire labled "W" (I assume is White to the other side of the switch "BR" (I assume Brown) to many different sensors, relays, ECU, etc. Can your alarm output +12 volts only when you request a remote start mode? Probably an internal relay in the alarm would do this. If so, installing a 12 volt relay using the NO dry contacts across the "W (White) and BR" (brown) wire should do the trick. By using the alarm 12 volt remote start output to fire the relay you close the contacts. Of course the relay needs to stay energized to keep the bike running in this mode. Make sure the 12 V to the relay is not present when in armed and not armed mode but only when the remote start program is active. You do not want the relay to stay energized if not in remote start mode as the switch would remain on all the time. What is the brand and model of alarm you have? I do not understand your question about the 4 or five wires you mention. I would need a schematic or install manual and operator manual of the alarm to understand it before I could provide further advice.
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2007 VN900 Classic LT (Dragon Theme)
Cobra- Pipes, FI2000, Passenger Floor boards, Engine guard and luggage rack.
Memphis Shade with 9" windshield.
Chrome covers for neck, radiator, Rear brake Master Cylinder, and regulator.
RC Components Nitro Chrome wheels w/ Night Dragon Tires.
«obra Power Flo breather