1. (a) All wiring shall conform to current standards of SAE International.

2. (b) Circuits.

   1. (1) Wiring shall be arranged in circuits as required with each circuit protected by a fuse or circuit breaker or FET.
   2. (2) A system of color and number coding shall be used and an appropriate identifying diagram shall be provided to the end user along with the wiring diagram provided by the chassis manufacturer.
   3. (3) A system of color and number coding shall be used on buses manufactured after January 1, 1993.

   4. (4)

      1. (A) The following body interconnecting circuits shall be color-coded as noted: FUNCTION COLOR Left rear directional light Yellow Right rear directional light Dark green Stoplights Red Back-up-lights Blue Taillights Brown Ground White Ignition feed, primary feed Black
      2. (B) The color of the cables shall correspond to SAE International J1128.

   5. (5) Wiring shall be arranged in at least six (6) regular circuits as follows:

      1. (A) Head, tail, stop (brake), and instrument panel lamps;
      2. (B) Clearance and stepwell lamps (stepwell lamp shall be actuated when service door is opened);
      3. (C) Dome lamp (dual row – three (3) per side minimum on Type B, Type C, and Type D units);
      4. (D) Ignition and emergency door signal;
      5. (E) Turn signal lamps; and
      6. (F) Alternately flashing signal lamps.
   6. (6) Any of the above combination circuits may be subdivided into additional independent circuits.
   7. (7) Whenever heaters and defrosters are used, at least one (1) additional circuit shall be installed.
   8. (8) Whenever possible, all other electrical functions, such as sanders and electric-type windshield wipers, shall be provided with independent and properly protected circuits.

   9. (9) Each body circuit shall be:

      1. (A) Coded by number or letter on a diagram of circuits; and
      2. (B) Attached to the body in a readily accessible location.

3. (c)

   1. (1) All wiring shall have an amperage capacity equal to or exceeding the designed load.
   2. (2) All wiring splices are to be done at an accessible location and noted as splices on the wiring diagram.

4. (d) A body wiring diagram of easily readable size shall be:

   1. (1) Furnished with each bus body; or
   2. (2) Affixed in an area convenient to the electrical accessory control panel.
5. (e) The body power wire shall be attached to special terminal on the chassis.
6. (f) All wires passing through metal openings shall be protected by a grommet.

7. (g)

   1. (1) Wires not enclosed within body shall be fastened securely at intervals of not more than eighteen inches (18”).
   2. (2) All joints shall be soldered or joined by equally effective connectors.
8. (h) See 6 CAR § 334-112(c), Electrical wires and terminals, for additional information.

Codification Notes: “FET” means field effect transistor.