Make sure you read the entire steps twice before trying. Start the truck without stepping on the brake switch while holding the horn switch. As soon as the horn sounds, release the horn and key switch , press horn switch quickly and release, do not hold. You should now see, ThrtVxxx. Voltage should read 2.2 to 2.7 volts neutral. Adjust as needed. Cycle the handle through a full range, read 1.2 in reverse and about 3.8 in forward. If all is reading good, press the brake switch 3 times, display should read CyclePot. This is the calibration mode for throttle. Move the throttle handle full motion twice within 10 seconds. After 10 seconds lift will beep. Shut off system and unplug battery. Connect all and test. This may take a few times as it is difficult to get the first part right.