Replacement Light for a Peterson Manufacturing 421H 6.5" Oval Trailer Tail Light

Updated 05/21/2026 | Published 05/19/2026

Products Featured in This Question

Peterson LumenX LED Trailer Light - Brake, Tail, Turn - Weatherproof - 12V/24V - Oval - Red

(36)

$14.27

Right Angle 3-Wire Pigtail for Peterson Trailer Lights - 3-Prong PL-3 Plug - 10-1/2" Lead

(17)

$5.11

Peterson Trailer Tail Light - Submersible - Stop, Tail, Turn - Incandescent - Oval - Red Lens

(1164)

$14.77

Question:

I need to replace 2 utility trailer lights model number 421h, do you have them?

asked by: Hunterland G

Expert Reply:

Hey Hunter. From what I could find online the Peterson 421h is a 6.5" oval, surface-mount stop, turn, and tail light. To replace it, I recommend the Peterson LumenX LED Trailer Light item # M821R-10. This submersible LED light measures 6-1/2" long x 2-1/4" tall x 1-7/16" thick. It uses a PL-3 connector that works with the 3-prong plug item # 421-491.

The Peterson LumenX item # M821R-10 provides brake, tail, and turn signal functions. It is sold individually. It has 10 built in diodes that are going to be significantly brighter and last about 10x longer than the item # M421R you were looking at.

What kind of trailer do you have and do the dimensions in the diagram below match your current 421h lights?

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