How to find the right Automotive Side Marker Light Assemblies AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Automotive Side Marker Light Assemblies
- Position and color
- Front side markers amber, rear side markers red FMVSS 108 assigns color by position, and the front and rear housings are usually different part numbers.
- Vehicle versus trailer use
- For cars and trucks, buy by OE fitment; for trailers, buy by mounting style (surface, grommet, or bracket) and hole spacing Trailer markers are universal but must match the mounting footprint, and vehicle markers must match the body cutout.
- Bulb type
- Most vehicle markers take a 194/168/W5W wedge bulb; sealed LED trailer markers have no bulb to replace Knowing the bulb tells you whether a bulb swap could fix the issue before replacing the housing.
- Sealing and ground
- For trailers, prefer sealed LED with a dedicated ground wire rather than case ground Corroded case grounds through the mounting screw are the most common reason trailer markers go dark.
Brands that matter
- Dorman: Wide range of OE-style side markers, including small bumper and fender lamps.
- TYC: OE-style side markers for most passenger vehicles.
- Peterson Manufacturing: Trailer and RV side markers in incandescent and sealed LED.
- Optronics: Common trailer marker lighting, many sealed LED options.
- Maxxima: LED markers for trailers and work trucks.
What to avoid
- Unsealed incandescent markers on boat trailers that get submerged
- Universal markers forced into a car body cutout they were not designed for
- Clear or smoked markers on vehicles that need amber or red for inspection