Talk Morgan Forums Morgan Sports Cars Morgan Three Wheeler & Super 3 Revs not going to idle

Further investigation reveals that if the VSS is a hall effect device (very likely) then the three wires from it are power (YR), signal (YK) and signal ground (YB) and the VSS needs power to work. As the power and signal ground are common to several other sensors I think we can rule out any issues with the corresponding YR and YB wires from the sensor, connectors and looms. Clearly though Lauren's action of disconnecting the YB and YR wires at the sensor would disable it allowing the normal idle situation as he found, and given the current situation. This action would of course have killed the speed signal to the speedo and TSM as well, but just to be sure perhaps you can confirm that Lauren?

If above is correct then it brings us around in a rather large circle to my earlier untried suggestion of (temporarily) disconnecting just the speed signal to the ECU, YW wire out of bombtail leaving a working VSS to benefit speedo and TSM.