92 Ill. Adm. Code 442.620
Wiring
Section 442
Section 442.620 Wiring
a) See the FMVSS for requirements (49 CFR 571).
b) All wiring for lamps and other electrical devices shall be as
recommended for automobiles, motor coaches, and heavy duty starting motor
circuits in SAE Recommended Practices J1292 and J541a and in other practices or
standards referenced in the SAE Recommended Practices, unless specifically
preempted by the FMVSS or this Part.
c) Manufacturer's circuit arrangements are acceptable; however, a
separate circuit for the alternately flashing signal lamps and stop signal arm
lamps shall be installed.
d) Extra fuses for each size of fuse used on the bus may be
conveniently mounted on the bus body if specified by the purchaser.
e) A
noise suppression switch that is capable of turning off noise producing
accessories, including, but not limited to, heater blowers, defroster fans,
auxiliary fans and radios, must be present. (See Section 12-815.2 of the
Code.)