Current textIn force on Sept. 30, 2013Source: annual CFR editions 2005–2016
§ 393.23 Power supply for lamps.
Current wording, in the annual edition revised as of Oct. 1, 2005.
Before Jan. 1, 2017 the record is one snapshot per annual CFR edition, revised as of October 1. This is the 2012 edition's wording. An amendment that took effect between Oct. 1, 2012 and Sept. 30, 2013 would not appear until the next edition, so check the citations below and the Federal Register for exact effective dates.
49 CFR § 393.23 — Power supply for lamps.. Text in force on September 30, 2013. This wording effective October 1, 2005 to present. Source: govinfo, 2012 edition, https://www.govinfo.gov/app/details/CFR-2012-title49-vol5/CFR-2012-title49-vol5-sec393-23. Retrieved from FMCSR.com, https://fmcsr.com/reg/393.23?asof=2013-09-30, 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- [70 FR 48046, Aug. 15, 2005]
- 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.