Optronics 4 x 2-inch RV marker and clearance lights are available in several designs that look similar from the outside. The MC32 uses an incandescent bulb, the MCL32 uses three LEDs, and the MCL0032 uses one LED. All three families shown below have a reflex lens and mount on three-inch centres, but their wiring, depth and exact part numbers differ.
First measure the existing marker-light housing
The oblong MC32-family housing measures about four inches across and two inches high. It fastens to the RV on three-inch centres. A narrower four-inch marker lamp may be from another Optronics family and should not be matched only by length.
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MC32, MCL32 & MCL0032 size and mounting chart
The MC32 is about 1-1/8 inches deep, while the MCL32 and MCL0032 LED families are approximately one inch deep. Their 4 x 2-inch faces and three-inch mounting centres may appear compatible, but a replacement still needs the correct electrical connection, clearance behind the surface and colour for its intended position.
| Product family | Type | Dimensions | Mounting | Electrical connection |
|---|---|---|---|---|
| MC32 incandescent | Incandescent | 4 x 2 x 1-1/8 in | Surface, 3-in centres | Twist-in socket, separate ground |
| MCL32 three-LED | 3 LEDs | 4 x 2 x 1 in | Surface, 3-in centres | Black power / white ground |
| MCL0032 single-LED | 1 LED | 4 x 2 x 1 in | Surface, 3-in centres | Two wires; power-lead colour varies |
| A32 replacement lenses | Lens only | 4 x 2 x 1/2 in | Snap-in acrylic cover | No wiring included |
Optronics published specifications: MC32 incandescent 4 x 2 x 1-1/8 in; MCL32 and MCL0032 LED series 4 x 2 x 1 in. Measurements are approximate nominal housing dimensions, not a universal fit guarantee.
How to select the correct marker light or replacement lens
- Measure the old light: confirm a 4-inch wide by 2-inch tall oblong face and three-inch mounting-screw spacing.
- Check the lamp type: a twist-in #194 bulb indicates the MC32 incandescent design; MCL32 has three integrated LEDs, while MCL0032 has one.
- Identify the ground and connections: do not assume that a similar-looking LED light uses the same power lead colours or connectors as your original.
- Choose a repair: if the correct housing still works, compare A32 amber or red lens-only replacements. If the lamp assembly is damaged, select the exact complete model, base colour and packaging variant.
MCL32 uses black power and white ground on the listed models. MCL0032 lead colours vary by specific part and packaging. Check the manufacturer specification for the exact MPN and the RV wiring before making connections.
Optronics marker lights and A32 replacement lenses
Choose the exact model below to see the product photograph, description and online availability. Incandescent assemblies, three-LED lamps, one-LED lamps and lens-only components are grouped separately.
MC32 incandescent
The MC32 series uses a replaceable #194 incandescent bulb and a twist-in socket with a separate ground. Its acrylic reflex lens provides the reflector surface. Choose amber or red, then match a black or white base. This family is slightly deeper than the LED versions.
MCL32 three-LED
MCL32 replaces the incandescent bulb design with three LEDs inside an oblong reflex marker/clearance lamp. It has a two-wire connection: black power and white ground. The snap-on lens is replaceable, while the LEDs form part of the lamp assembly.
MCL0032 single-LED
MCL0032 is a single-LED reflex alternative in the same nominal 4 x 2-inch body size. The selected amber and red examples have black bases, with bulk and retail-packaged options. Lead colours differ between specific MPNs, so follow the correct product specification instead of assuming the MCL32 colour convention.
A32 replacement lenses
When the matching lamp operates but its reflex cover is cracked, A32ABP (amber) or A32RBP (red) replaces the lens alone. The manufacturer lists these snap-in acrylic covers for the compatible MC32, MCL32 and MCL0032 families. The bulb, LEDs, housing and wiring are not included.
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