Loading the Vehicle

As a load is added to the vehicle, the vehicle body lowers causing the height sensor arm to rotate upward. If the body lowers enough such that the sensor arm rotates above the in "trim zone." the height sensor closes switch B and activates the internal timing circuit. If the vehicle maintains this condition for more than the minimum delay of 7 to 14 seconds, the height sensor closes switch C, completing the compressor relay circuit to ground. The compressor then supplies compressed air through the air dryer and air lines, to the air shocks.

As the air shocks inflate, the vehicle body raises, causing the height sensor arm to rotate downward. Once the height sensor arm reaches the in-trim zone, the height sensor opens switch B, opening the compressor relay circuit, and shutting off the compressor.