Your cart is empty
Browse our catalog to find the parts you need.
These images are illustrative and may not match the product exactly. Always verify by part number — or confirm instantly with the assistant using a photo or VIN.

Peterson · Electrical & Lighting
PETM138A
In stock · ships from Knoxville
The Peterson M138A is a rectangular, amber clearance and side marker light commonly used on trailers, RVs, and utility vehicles.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 3 applications
Add your truck to see whether it's one of them
All confirmed applications for this part number.
Other applications
Other applications
Universal fitment for any application requiring a surface-mount, 3-inch center, amber clearance or side marker light. Commonly used to replace lights in the Peterson 138 series.
Part data verified against 5 catalog sources
Different year, make, or config? Get a confirmation against your truck in under a minute.
It features a two-bulb 'Double Bulls-Eye' design for increased visibility and includes VIBAR sockets that absorb road shock to extend bulb life. This light is typically replaced when the lens cracks, the housing corrodes, or the bulbs fail due to weather exposure and vibration over time. It mounts on 3-inch centers and grounds through the mounting hardware with a single wire for the electrical connection.
Part Number: PETM138A
LIGHT AMBER MARKER
Unit: ea
Dealer: Knox Trailers
Compatibility, alternatives, and more
Parts commonly needed alongside electrical & lighting