Peterbilt 389 Cab Lights

Frequently Asked Questions About Peterbilt 389 Cab Lights

Will these cab lights fit my Peterbilt 389 without modification?

Most cab lights in this category are designed to bolt into the existing mounting holes on the Peterbilt 389 cab marker light panel, so no cutting or drilling is typically required. However, it's important to confirm the specific mounting style (bracket-mounted, panel-mounted, or clearance light style) matches your truck's setup before ordering, especially if your cab has been modified or fitted with aftermarket panels in the past.

What's the difference between LED and incandescent cab lights, and which should I choose?

LED cab lights draw less power, run cooler, and generally last significantly longer than incandescent bulbs, making them the more popular choice for daily drivers and show trucks alike. Incandescent lights are typically less expensive upfront but require more frequent bulb replacement. Most customers find the longer lifespan and brighter, more consistent light output of LEDs worth the extra initial cost.

Are these cab lights DOT compliant for on-road use?

Many cab lights are sold as clearance or marker lights that meet DOT requirements for color (amber, red, or clear with amber bulbs) and placement, but compliance ultimately depends on how and where they're installed on your truck. Always check the product listing for DOT certification and make sure the lens color and bulb combination follow FMVSS 108 standards before hitting the road.

What lens colors and housing finishes are available?

Cab lights typically come in amber, red, clear, and smoked lens options, with housings available in chrome or black to match your truck's overall look. Clear lenses paired with amber or red LED bulbs are a common choice for a cleaner appearance while still meeting visibility requirements.

How do I wire and install new cab lights?

Installation generally involves removing the old light assembly, connecting the new light's wiring harness to your truck's existing marker light circuit, and securing the housing with the factory mounting hardware. Many cab lights use a simple two-wire or plug-and-play connection, but it's a good idea to check for any wiring diagrams or instructions included with your specific light kit, and to test each light before finishing the install.