What The M09300Y Is
This is a small round red LED marker, 3/4" diameter, running on 12V. It covers side marker and clearance duty on tractors, trailers, dry vans, flatbeds and body-built equipment. The housing is sealed and smooth-faced, so there is no lens seam to trap grit and no bulb socket to corrode. It is a DOT-certified aftermarket lamp, not a decorative accent light.
The build is solid-state. No filament means nothing to shake apart on washboard road or over a rough dock apron. The sealed body is rated IP67, so wash bay pressure and standing water at the bottom rail of a trailer are not what kills it. Current draw is low compared to an incandescent lamp of the same size, which matters when a trailer carries twenty-plus markers on one circuit.
One part number covers front, rear, left and right positions, so a fleet can stock a single red 3/4" marker instead of four line items. That is the main reason parts managers pull this number: it consolidates the shelf. Confirm the color and position requirement for your application before you standardize on it.
Why These Numbers Cross
M09300Y and the Maxxima number M09300YCL describe the same physical lamp: 3/4" round body, red lens, 12V LED, sealed construction. The suffix on the Maxxima number is a packaging and lens designation, not a different lamp. Dimensionally and electrically the two land in the same hole with the same wiring.
Small round markers cross cleanly because the format is standardized. The mounting hole diameter, the grommet profile and the two-wire pigtail are common across manufacturers. When body diameter, voltage, color and DOT code all match, the lamps are interchangeable in the hole regardless of whose name is molded on the back. That is why one 3/4" red marker supersedes another so easily.
PartStop LLC is not affiliated with, endorsed by, sponsored by, or authorized by any OEM manufacturer. The Maxxima number is listed for identification only, so you can confirm you are looking at the right lamp. A cross-reference is a starting point — verify fit against the number stamped on the old lamp or against your VIN before you commit to a bulk order.
Check Before You Order
Pull the old marker and read the back of the housing. Most markers carry the manufacturer number and the DOT code molded into the base. If the number you find is not M09300Y or M09300YCL, measure the body diameter and confirm you are dealing with a 3/4" lamp and not a 1" or 2" round. Those sizes look similar in a dirty panel and will not swap.
Check the mounting method too. A 3/4" marker can be grommet-mounted through a drilled hole or run in a surface bracket, and the two are not the same job. Also confirm your system is 12V. Then check the wiring — a corroded ground at the crossmember is the most common reason a new marker looks dim or flickers after install. Clean the ground before you blame the lamp.
M09300Y Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to M09300Y. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Maxxima | M09300YCL |
Frequently asked questions
Is M09300Y the same light as Maxxima M09300YCL?
They describe the same 3/4" round red 12V LED marker. The suffix on the Maxxima number is a lens and packaging designation, not a different lamp body. Dimensions and wiring match, so the two interchange in the same hole. Confirm against the number on your old lamp before ordering a full set.
Will this fit a 1" round marker hole?
No. This is a 3/4" lamp and it will sit loose in a 1" hole. Measure the hole or the old lamp body before ordering. If you are replacing a larger round marker you need a lamp sized for that opening, or a grommet and panel change. Do not force a smaller lamp and seal it with adhesive.
Why does my new LED marker flicker or read dim?
Almost always a ground problem. LED markers draw very little current, so a marginal ground that still lit an incandescent lamp will make an LED flicker. Clean the ground stud, check for a corroded pigtail splice, and verify the circuit is a steady 12V. Also check for a cracked grommet letting water into the connection.
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Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
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