I wonder if any of the guys that wired to the flash to pass button have had any problems???
I was worried after reading that the ftp button had 12v on one side and then a ground that had some positibe volts sometimes on the other.
I would rather wire to the ftp button if it doesnt cause any issues.
Thanks,
Huero
It seems a little strange, but this is how they typically wire controls for most motorcycles:
12V of "signaling" power (low amperage) goes to one end of the switch directly from the ECU. A ground wire goes to the other end. When a button or switch is pressed, "signaling" power is sent directly to ground through the switch. The ECU has circuitry in it that detects a short and triggers a relay (solid state) to supply large amounts of power to the horn, lights, etc. Because power always travels the path of least resistance, the signaling power never travels "up" the ground wire and instead ends at the switch.
Now, here lies your dilemma...
The switch, isolated from the ECU, would control the display without problems. However, because the ECU is continually feeding 12v of power into the other side of the switch, that power would be continually fed to the display circuity while the button wasn't being pressed. More than likely it would fry the circuitry as most PLCs are low voltage...