Installing and Using a Manual TCC Switch
Overview
Some HGM transmission controllers offer the ability to manual engage the torque converter clutch through the use of a pushbutton switch. Depending on driving modes, this function may or may not be enabled, and may cancel automatically based on calibration settings.
The controller requires a push button normally open switch that connects to ground when pressed. Some controllers offer an output to drive an LED to indicate when the manual TCC function is enabled.
HGM offers an engraved billet TCC switch that includes a ring LED lamp.
Installing the HGM Billet Switch
Locate a position that is easy to reach from the driver's seat.
Drill a 19mm or 3/4" hole for the switch.
Install the switch from the front with the o-ring in place.
Install the nut on the rear of the switch. Tighten gently.
There are four wires on the switch harness as follows:
Wire Color | Function |
|---|---|
Black | LED Ground |
Red | LED Power |
Green | Switch Common |
Yellow | Switch Normally Open |
The black and yellow wires are normally supplied connected together into a ground lug. The LED can be safely powered by 12V, as there is a resistor in the switch.
The green wire on the switch connects to the COMPUSHIFT wire labelled “TCC Manual Mode”
The red wire from the switch connect to the COMPUSHIFT labelled “TCC LED”.
Using the Switch
Press the switch to lock the manually lock the torque converter clutch.
Press the switch again to unlock the torque converter clutch.
The LED will light any time the torque converter clutch is engaged.