Frequently Asked Questions About Peterbilt 359 Cab Lights

Will these cab lights fit my specific year Peterbilt 359?

Most aftermarket cab lights for the Peterbilt 359 are designed to fit models from 1967 through 1987. However, slight variations exist between early models (1967-1985) and later models (1986-1987) due to cab roof changes. Always verify the mounting hole spacing on your truck matches the light specifications. Standard 359 cab lights typically require five evenly spaced holes across the roof, with center-to-center spacing of approximately 6 to 7 inches.

What's the difference between incandescent and LED cab lights for my 359?

LED cab lights draw significantly less power (typically 0.5 amps versus 2-3 amps for incandescent), last 50,000+ hours compared to 2,000 hours, and produce less heat. While LED options cost more upfront, they eliminate frequent bulb replacements and reduce alternator strain. Incandescent lights offer the traditional warm glow many drivers prefer and are easier to find replacement bulbs for on the road. Both styles use the same mounting hardware and wiring connections.

Do I need to drill holes in my cab roof to install these lights?

Yes, installing factory-style cab lights requires drilling five holes in your cab roof if not already present. Each hole should be 3/4 inch diameter for standard lights. Professional installation is recommended to ensure proper placement, weatherproofing, and to avoid damaging the headliner. Some drivers opt for magnetic or adhesive-mounted LED strips as a no-drill alternative, though these lack the authentic 359 appearance.

What wire gauge and fuse size should I use for cab light installation?

For a five-light setup, use 16-gauge wire for runs under 15 feet from the fuse box, or 14-gauge for longer runs. Install a 10-amp inline fuse for incandescent lights or a 5-amp fuse for LED lights. Connect to a switched power source so lights turn off with the ignition. Always use weatherproof connectors and seal all roof penetrations with butyl tape or appropriate sealant to prevent leaks.

Are chrome, stainless steel, or painted cab light housings better?

Stainless steel housings offer the best long-term durability and won't rust, pit, or require polishing like chrome. Chrome-plated housings provide the brightest mirror finish when new but require regular maintenance and may eventually peel or pit. Painted housings match your cab color but can chip and fade over time. For trucks exposed to road salt or coastal conditions, stainless steel is worth the extra investment.