| 摘要 |
To automatically disable the tractor brake antilock system if a trailer is connected thereto which does not have an antilock system (but leaving the antilock system intact if the tractor operates separately, or with a brake antilock-equipped trailer), a control relay is provided which is energized through a connection in the separable tractor-trailer electrical system connector, the connector including in the trailer portion thereof a separate terminal which is either grounded, or not, depending upon whether the trailer is equipped with an antilock system or not; if the trailer is equipped with an antilock system, a ground connection is established to the relay, through the trailer connector, to energize the relay. If the trailer is not so equipped, the ground connection is broken and the relay remains de-energized. To permit energization of the relay if the tractor is operated independently, either a normally closed switch is included in the connector which is opened when the connector is engaged, or a normally closed relay is provided on the tractor, which is energized by current flow to the trailer, for example upon operation of the brake lights thereof.
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