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.
Grote · Electrical & Lighting
GRT44440
In stock · ships from Knoxville
This is an automatic electronic switch that controls interior dome lights in heavy‑duty trucks and trailers.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 2 applications
Add your truck to see whether it's one of them
All confirmed applications for this part number.
Other applications
Other applications
Commonly used on Class 8 trucks and trailers to automate dome light shut‑off. Not specific to a single make/model.
Part data verified against 5 catalog sources
Numbers this part supersedes or interchanges with. Showing 2 of 2.
Different year, make, or config? Get a confirmation against your truck in under a minute.
It has a built‑in timer that leaves the lights on for about 40 minutes after you turn them on, and an accelerometer (motion sensor) that shuts them off automatically when the vehicle starts moving. It replaces older mechanical switches that tapped into the air brake system, making wiring simpler and reducing the number of parts. You would replace this module if your dome lights stay on constantly, won’t turn off, or if you’re upgrading from an old air‑actuated style switch.
Part Number: GRT44440
INT. DOME SWITCH
Unit: ea
Dealer: Knox Trailers
Compatibility, alternatives, and more
Parts commonly needed alongside electrical & lighting
