Replacing an RV clearance or side-marker lamp? Start with the mounting style and the electrical connection. Optronics offers mini-thinline lights, round grommet LEDs, four-inch incandescent reflex lamps and rectangular LED reflex models. These are distinct systems, so check the actual part number, opening and wiring before choosing a replacement.
Three mounting shapes to identify first
Simplified category icons show basic shapes only, not true part drawings, drilling templates or interchange information.
Compare Optronics marker and clearance light families
The table groups products by actual housing dimensions, the specified mount and wiring. Different models within a family can have different wires or included hardware.
| Series | Listed size | Mount | Electrical / component type |
|---|---|---|---|
| AL90 mini-thinline LED | 2-1/2 × 1-1/4 × 1 in | Mini rectangular mount | Light-only or self-grounding base-and-pigtail kit |
| MCL10 3/4-inch round LED | 0.73-in light; 3/4-in nominal opening | A11GB rubber grommet | Hard-wired black power and white ground |
| MC44 incandescent reflex | 4 × 1-1/2 × 0.938 in | Rectangular surface mount; 3-in hole centres | Two-wire lead and ground; replaceable #194 bulb |
| MCL40 two-LED reflex | 4 × 1-1/2 × 0.938 in | Rectangular surface mount; 3-in hole centres | Two-wire; separate power and ground |
| MCL44 six-LED self-grounding | 4 × 1-1/2 × 0.938 in | Rectangular surface mount; 3-in hole centres | One power wire; ground through mounting |
| MC/MCL44 replacement lens | For compatible 4-in reflex series | Snap-on acrylic lens component | No wiring; replacement cover only |
Four checks before buying a new marker light
- Measure the old mount. Check overall body shape, screw-hole centres or grommet opening. Do not use length alone to establish fit.
- Check how it grounds. Some kits ground through mounting hardware; others have separate black-power and white-ground wires. Match the actual model's wiring.
- Identify the lamp type. Incandescent MC44 bulbs can be replaced; sealed AL90/MCL10 LEDs are different assemblies, while the MCL40/44 reflex lens can be serviced separately.
- Match the exact part number and colour. Check the product photograph, included mounting pieces and vehicle lighting requirements before ordering.
Optronics marker lights and replacement components
Each card below leads to the exact product on NewRVParts, including kits, light-only variants and replacement components.
AL90 mini-thinline LED
AL90 sealed one-LED lamps are miniature rectangles. The AL90ABP and AL90RBP listings are light-only, while AL90AK and AL90RK are kits with A91BB black base and A91LW pigtail. The kit uses the mounting hardware as its ground path.
MCL10 3/4-inch round LED
MCL10 one-LED sealed round lamps sit in an A11GB mounting grommet. The catalog models below include amber light MCL10AKB, its polypack MCL10AKBP, and red MCL10RKB. The manufacturer's nominal cutout for this series is 3/4 inch; confirm the existing opening and mounting material.
MC44 incandescent reflex
Optronics MC44 lights have an incandescent bulb behind a snap-on acrylic reflex lens. The four-inch rectangular housing mounts on three-inch centres; the two-wire assemblies have separate lead and ground conductors. An integrated reflex lens provides reflectivity.
MCL40 two-LED reflex
The MCL40 family retains the familiar four-inch reflex-rectangle form but uses two LEDs instead of a replaceable incandescent bulb. Both selected polypack versions have separate power and ground wires.
MCL44 six-LED self-grounding
MCL44AB1 and MCL44RB1 are six-LED rectangular reflex lights with a one-wire, self-grounding arrangement. The manufacturer separately offers two-wire MCL44 models, so check the exact suffix before ordering.
MC/MCL44 replacement lens
A44RBP is the red snap-on acrylic reflex lens. It is a replacement cover for the manufacturer-listed MC/MCL44 marker-light family, not a complete electrical light assembly.
Manufacturer series specifications: AL90 mini-thinline · MCL10 round LEDs · MC44 incandescent · MCL40/44 LED reflex. Check the exact model number before selecting wiring or mounting components.
NewRVParts products are ordered online and ship from supplier warehouses; there is no onsite viewing or pickup.