Trombetta's Diesel Pre-Heat Module is a temperature sensing and timing module designed to provide optimum control of Diesel Engine/Cold Starting assist devices such as glow plugs and air intake heaters.
When the ignition switch is turned to the run position, the S500-B100-02 module powers the glow plugs and/or air intake heating elements. This keeps them energized for a predetermined time based on the ambient temperature.
At the same time, the module can activate a dashboard "wait" indicator light, which remains 'on' until the glow plug or air intake heater reaches the required temperature then turns 'off', signaling the operator to turn the key to start the engine.