Trailer Alarm Kit gives audio warning of back-up.

Press Release Summary:

Automatic trailer Back-up Alarm System provides awareness of backward vehicle movement in areas of limited maneuverability and visibility. Wheel-end direction sensor reads ABS tone ring, activating 97 dB repeating pound pulse alarm after ½ of reverse revolution of tire. Alarm ceases 2 sec after trailer stops or immediately upon forward movement. Kit comes with direction sensor, electronic control unit, wiring harness, and alarm.

Original Press Release:

Hendrickson Back-Up Alarm System Gives Trailers Audio Exposure

CANTON, OHIO - Hendrickson unveils an automatic trailer Back-up Alarm System for improved awareness of backward vehicle movement in areas of limited maneuverability and visibility. Trailer manufacturers can install the audible alarm system on new vehicles, or it can be purchased through the Hendrickson aftermarket network for retrofitting. With rearward trailer movement, the system activates a very loud warning sound to help alert bystanders and other drivers in areas such as congested dock operations and near crosswalks and walkways that the vehicle is moving in reverse. A wheel-end direction sensor reads the ABS tone ring activating the alarm, a 97-decibel repeating pound pulse, after one-half of a reverse revolution of the tire. The alarm ceases two seconds after the trailer stops or immediately upon any forward movement. The system comes in a kit, which includes a direction sensor, electronic control unit, wiring harness and alarm. The electronic module features an additional output that may be wired for a warning or back-up light (not included in the kit). The easy-to-install, stand-alone, automatic system requires no communication with the tractor and features reverse polarity protection and reset fuses. For additional information about equipping your trailer with the Back-up Alarm System, contact Hendrickson International, Trailer Suspension Systems, Canton, Ohio, toll free at 866-RIDEAIR (743-3247). Hendrickson International is one of the largest global suppliers of truck and tractor suspensions; trailer suspensions; lift, trailer and steer axles; springs; bumpers, and stamped components to the commercial transportation industry. Headquartered in Woodridge, Ill., Hendrickson has been meeting the needs of the transportation industry for 90 years. Visit the Hendrickson web site at

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