Peterbilt 389 Frame Light Bars & Filler Panels

Frequently Asked Questions About Peterbilt 389 Frame Light Bars & Filler Panels

What are frame light bars and filler panels used for on a Peterbilt 389?

Frame light bars and filler panels mount along the chassis rail between the cab and rear of the truck, or between the bumper and frame, to close visual gaps and provide a mounting location for auxiliary lighting. They combine a finished, custom appearance with functional lighting for marker, turn signal, or accent purposes.

Will a frame light bar or filler panel fit my specific Peterbilt 389 configuration?

Fitment depends on your truck's frame width, wheelbase, and existing bumper or fairing setup, since these panels are designed to fill specific gaps on the 389 chassis. Always check the listed dimensions and compatible frame length before ordering, and reach out to our team if you are unsure how a panel will fit your particular setup.

What materials and finishes are these panels available in?

Most frame light bars and filler panels are constructed from stainless steel or aluminum for durability and corrosion resistance. Common finish options include polished stainless, brushed stainless, and painted or powder-coated finishes, allowing you to match the panel to the rest of your truck's trim.

Do these panels come pre-drilled for lights, and what type of lighting do they accept?

Many filler panels and light bars come pre-drilled with mounting holes for standard round or oval LED lights, though hole size and spacing vary by product. Check the product specifications for light size and quantity before purchasing so you can order the correct lights and grommets to match.

How difficult is it to install a frame light bar or filler panel, and what wiring is involved?

Installation typically involves bolting or clamping the panel to the frame rail using existing mounting points, then running wiring for any integrated lights back to a power source and ground. Most installations can be completed with basic hand tools, but you should have a wiring diagram or basic electrical knowledge on hand if the panel includes lighting, since wire routing and connections vary by application.