I have an electric shift solenoid wired like the diagram in another thread by "greenduster71". I used the brown/white wire to trigger the shifter. It uses power to engage and a break in the ground to release. Tested this using the MSD ignition tester and the shifter engages at the correct RPM. All functions appear to be fine. The problem comes when the transbrake button is pressed. The shifter releases as soon as it's pressed.

Is there another function tied in from the launch RPM to the brown/white RPM limiter that is causing the brown/white wire to activate when the transbrake button is pressed?

Thanks in advance.