§FMCSR.com
Reading the regulations as they stood on May 11, 2026. Current text may differ.Switch to current
Current textIn force on May 11, 2026Source: eCFR

§ 393.23 Power supply for lamps.

Current wording, in the annual edition revised as of Oct. 1, 2005.

eCFR as of May 11, 2026 ↗
49 CFR § 393.23 — Power supply for lamps.. Text in force on May 11, 2026. This wording effective October 1, 2005 to present. Source: eCFR as of May 11, 2026, https://www.ecfr.gov/on/2026-05-11/title-49/section-393.23. Retrieved from FMCSR.com, https://fmcsr.com/reg/393.23?asof=2026-05-11, on October 26, 2026. Unofficial compilation; verify against the official source.

All required lamps must be powered by the electrical system of the motor vehicle with the exception of battery powered lamps used on projecting loads.

[70 FR 48046, Aug. 15, 2005]

Amendment history

2 distinct wordings on file since Oct. 1, 1996
  1. Oct. 1, 2005 → presentannual editions 2005–2016diff vs. previousviewing
    [70 FR 48046, Aug. 15, 2005]
  2. Oct. 1, 1996 → Oct. 1, 2005annual editions 1996–2004

A new entry appears whenever the regulatory words change between government snapshots. Day-precise from the eCFR (2017 onward); before that, one snapshot per annual CFR edition (revised as of October 1). Bracketed citations are the Federal Register history printed with the section.