ADDING AIR HORNS, SWITCH SELECTABLE center position. Contact rating is not a concern, as this switch will only be switching the relay coils -- less than ½. ADDING AIR HORNS 28 SCHEMATIC DIAGRAM (with existing horn relay) HORN BUTTON P P EXISTING HORN RELA Y EXISTING HORNS HI LO NEW HO RN EL Y PB PB PY 86 85 30 7 SPDT SELECTOR SWITCH FIGURE.. Installation InstructionsProper installation of a train or truck air horn is the key to having a great system. With more than 20 years of experience an. Air Horns of Texas, Train Horns, Train Air Horns. Call 956-682-1630. Read our standard duty wiring diagram.
1. Drain all air from tank. (Compressor to be turned OFF to prevent it from running due to pressure drops in the air tank). 2. Using 1/2" wrench, disconnect horn air line from solenoid by loosening 1/2" compression nut. 3. Using 3/4" wrench, loosen and remove brass outlet fitting that the air line was attached to. Removal of this fitting allows.. If you think an air horn might be right for your truck, start by getting a truck air horn wiring diagram pdf. Doing so will provide you with the step-by-step instructions you need in order to install your horn correctly and safely. 36 Isuzu Trucks Service Manuals Free Truck Manual Wiring Diagrams Fault Codes Pdf.