Quote Originally Posted by Bigrig View Post
apparently the solenoid lockup voltage is similar to the dizzy module only needing around 5 volts with only a mild change to this (plus or minus 10%) being able to cause issues ...
That doesn't sound right for a GQ.
Page 66 of the AT service manual says terminal 22 (torque lock-up) of the TCU should be between 8 and 15 volts when the converter locks, and 1V or less when it's not locked.

The earth strap might still help though.