Document Name: SAE J Automobile, Truck, Track-Tractor, Trailer, and Motor Coach Wiring CFR Section(s): 49 CFR Standards Body: Society of . Find the most up-to-date version of SAE J at Engineering Electrical wiring shall be installed and maintained to conform to SAE J – Automobile, Truck, Truck-Tractor, Trailer, and Motor Coach Wiring, October , .
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NOTE— Contact of the trailer king pin or apron plate with the lower coupler or grounding through the coupler is not to be considered as providing a tractor-to-trailer ground. All conductors are to be constructed in accordance with SAE Jl and J except when good engineering practice dictates special strand con- structions. Also available protection for the core. Extreme care shall be used by the design engineer in choosing resistance wire as a conducting material to satisfy the current demand of the device and not create a temperature rise in the conductor that would deteriorate the insulating material even though the device is left on continuously.
Full text of ” SAE J Structure of the trailer, and c. Criminal penalties may apply for noncompliance.
Wiring connections to lights mounted on the coach body shall be accessible from sar, with the light removed or through an access door in an interior trim panel. The ground wire for insulated-return systems shall be equal to the respective feed wire. Motor Coach Section 6. Where impractical, the coding is to be followed to a junction block or harness ter- minating point where visual inspection will identify the circuit coding change.
A jumper cable with cable plug conforming to SAE J Circuit protection shall be aae by utilizing fuses, circuit break- ers, or fusible links which conform to SAE Standards. It is further desirable for all motor vehicle manufacturers to assign and use similar color code information for commonly used electrical circuits to promote ease of circuit analysis in service among the various manufacturers. Wiring exposed to such conditions shall be further protected by either, or a combination of, the use of heavy wall thermoplastic insu- lated cable, see SAE Standard J, Low Tension Primary Cable additional tape application, plastic sleeving or conduit, nonmetallic loom, or metallic or other suitable shielding or covering.
This is written principally for new vehicles but is also applicable to rewiring and service. Ground terminals shall be accessible for service: A multitude of dif- 7. Left rear stop and turn Yellow. Devices, lamps, and so forth requiring ; peri- odic service shall be serviceable arid accessible by providing’ wife length suffi- cient to reasonably accomplish this.
Ground terminal devices shall be eadmium,. Battery strap is available Resistance wire low tension cable may be used to limit the voltage applied to electrical devices.
NOTE — Extra protection such as braid, loom, conduit, etc. Clips for retaining cables and har- nesses shall be securely attached to body or frame member and cable or harness. Unless otherwise indicated, the latest version of SAE publications shall apply. A ser- rated paint cutting terminal may be utilized to make proper contact on painted surfaces.
Secondary applications will dictate the use of special terminations for special use or application. Avoid areas of excessive heat, vibration, arid abrasion. Whatever coding system is chosen, the system shall facilitate in harness manufac- turing and in service. Insulated or nonconductive supports shall be used. This practice applies to wiring systems of less than 50 V. A terminal shall be attached to a Conductor by a simple mechanical crimp-type process that will cbrafonri to the intent of paragraph 3.
Heavier conductors may be required to protect the carrying of current in wire bundles when all conductors are carrying maximum current. A general design guide would be that the conductor will be required to dissipate no more than 5 W per insulated conductor foot.
Polyvinyl chloride PVC can be used in most applica- are sleeves and covers which provide additional circuit and corrosion protection, tions; cross-linked polyethylene, hypalonj neoprene; etc. Clips also assist in locating and routing at assembly. Circuit Termination— Wiring for trailer circuits shall terminate in: Since the nature of the wire is to limit the voltage applied to electrical devices, the distance of the device from the power source and the j2192 rent demand of the device will determine the materials used.