Identify RV Marker & Clearance Lights

An RV marker lamp can be missing its cover, have a broken housing, or stop lighting altogether. To identify the correct replacement, compare the original shape, fastener spacing, wires and lens type before shopping by colour. This reference groups Optronics models by how they mount, not just how similar they look.

Start with the lamp body and its mount

Screw-on rectangle MC44, MCL40/44 · 3-in hole centresIdentify the existing bulb/LED and number of wires

Push-in round light MCL10 · A11GB grommetCheck the body opening and separate ground lead

Compact sealed lamp AL90 · small rectangular bodyLight-only or base-and-pigtail kit?

Simplified category icons show basic shapes only, not true part drawings, drilling templates or interchange information.

Optronics series matching chart

Use these family characteristics to narrow the choices. The same outer footprint does not prove the electrical connection or lens is the same.

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

Check the ground connection: One-wire self-grounding lights require the correct mounting-ground path. Do not assume a lamp with two electrical leads can be replaced by a single-wire assembly simply because its lens looks alike.

Identify the existing lamp step by step

Look for the molded model number on the rear of the old lamp or the mount.
Photograph the front and the mounting holes, then record dimensions before the original is discarded.
Identify whether you have one or two electrical leads and whether the ground depends on the mounting surface.
Check for a removable snap-on reflex lens, a replaceable incandescent bulb, or an integral sealed LED module.
Compare the relevant model and component photographs below; select the same lamp family unless a complete conversion has been properly checked.

Compare the exact Optronics parts in our catalog

These listings are grouped to make model identification easier. Open the specific product to check its availability and description.

Identify AL90 mini-thinline LED

Check for the slim 2-1/2-inch lens and the black A91BB-style base. A bare AL90 light differs from an AL90AK/RK retail kit; the latter adds the base and single-wire self-grounding pigtail. The shape alone does not identify the connector.

Optronics AL90ABP amber mini led, light only catalog product image

Optronics AL90ABP — Amber mini LED, light onlyLED / light only. Polypack light without the retail mounting kitCompare listing and condition

Optronics AL90RBP red mini led, light only catalog product image

Optronics AL90RBP — Red mini LED, light onlyLED / light only. Polypack light without the retail mounting kitCompare listing and condition

Optronics AL90AK amber mini led kit catalog product image

Optronics AL90AK — Amber mini LED kitLED / base kit. A91BB mount and A91LW self-grounding pigtailCompare listing and condition

Optronics AL90RK red mini led kit catalog product image

Optronics AL90RK — Red mini LED kitLED / base kit. A91BB mount and A91LW self-grounding pigtailCompare listing and condition

Identify MCL10 3/4-inch round LED

The MCL10 series is a small round push-in grommet system, not a screw-on rectangular lamp. These examples include the A11GB grommet. Verify the .75-inch nominal cutout and the two-wire connection before assuming a replacement fits.

Optronics MCL10AKB amber 3/4-in grommet led catalog product image

Optronics MCL10AKB — Amber 3/4-in grommet LEDLED / grommet. A11GB grommet included; separate power and groundCompare listing and condition

Optronics MCL10AKBP amber 3/4-in led polypack catalog product image

Optronics MCL10AKBP — Amber 3/4-in LED polypackLED / grommet. Polypack of the A11GB-grommet amber assemblyCompare listing and condition

Optronics MCL10RKB red 3/4-in grommet led catalog product image

Optronics MCL10RKB — Red 3/4-in grommet LEDLED / grommet. A11GB grommet included; separate power and groundCompare listing and condition

Identify MC44 incandescent reflex

Find a four-inch rectangular housing with a snap-on reflex cover and replaceable incandescent bulb. MC44ABP is amber, MC44RBP is red. Compare mounting holes and the existing two-wire setup; do not substitute an LED self-grounding version without checking the installation.

Optronics MC44ABP amber incandescent reflex lamp catalog product image

Optronics MC44ABP — Amber incandescent reflex lampIncandescent. Two-wire rectangular light with reflex lensCompare listing and condition

Optronics MC44RBP red incandescent reflex lamp catalog product image

Optronics MC44RBP — Red incandescent reflex lampIncandescent. Two-wire rectangular light with reflex lensCompare listing and condition

Identify MCL40 two-LED reflex

If the existing four-inch rectangular reflex lamp has two LEDs, inspect its wiring: MCL40ABP and MCL40RBP are two-wire versions. They should not be confused with one-wire self-grounding MCL44 lights even when the lens outline looks similar.

Optronics MCL40ABP amber two-led reflex lamp catalog product image

Optronics MCL40ABP — Amber two-LED reflex lamp2 LEDs. Two-wire rectangular reflex lightCompare listing and condition

Optronics MCL40RBP red two-led reflex lamp catalog product image

Optronics MCL40RBP — Red two-LED reflex lamp2 LEDs. Two-wire rectangular reflex lightCompare listing and condition

Identify MCL44 six-LED self-grounding

Count the LEDs and inspect the ground path. MCL44AB1 (amber) and MCL44RB1 (red) are six-LED single-wire versions whose ground connection depends on the mount. A two-wire lamp is not the same electrical configuration.

Optronics MCL44AB1 amber six-led self-grounding light catalog product image

Optronics MCL44AB1 — Amber six-LED self-grounding light6 LEDs. One-wire surface-mount arrangementCompare listing and condition

Optronics MCL44RB1 red six-led self-grounding light catalog product image

Optronics MCL44RB1 — Red six-LED self-grounding light6 LEDs. One-wire surface-mount arrangementCompare listing and condition

Identify MC/MCL44 replacement lens

A44RBP is a red replacement lens only. It can help when the compatible MC/MCL44 lamp works but its lens is damaged; it does not include a lamp body, bulb, LED module or wiring.

Optronics A44RBP red snap-on reflex lens catalog product image

Optronics A44RBP — Red snap-on reflex lensLens only. Compatible MC/MCL44-style lens componentCompare listing and condition

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.

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Identify RV Marker & Clearance Lights by Shape, Mount & Part Number