Beall - Operations Manual - Petroleum Tank Trailers

31 SAFE COUPLING PROCEDURE

1.5 AIR, ELECTRIC AND HYDRAULIC CONNECTIONS Air and electrical connects can vary greatly due to variations in trailer equipment and truck and electric connections on your trailer. 1. Connect air for service and emergency. These are typically color coded. Red (emergency). Blue (service). 2. Connect the 7 way plug to the 7 way receptacle. This is typically the primary electrical connection. 3. Connect all other electrical and hydraulic connections required. All connections should positively lock into place.

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