Frequently Asked Questions About Freightliner M2 Business Class Cab Lights

Will these cab lights fit my specific year and model Freightliner M2?

Our cab lights are designed to fit Freightliner M2 Business Class trucks from 2003 to current model years. However, there are variations between the 106 and 112 models, particularly in roof curvature and mounting hole spacing. We recommend checking your specific model number (found on your door jamb sticker) or calling our technical support team at 1-888-875-7787 with your VIN to ensure proper fitment. Pre-2003 models may require additional mounting hardware or modifications.

What's involved in the installation process, and can I do it myself?

Installation typically takes 2-4 hours and requires basic electrical knowledge. You'll need to drill five evenly-spaced holes in your cab roof (template usually included), run wiring to your clearance light circuit, and seal all penetrations with quality silicone sealant. Most installations require a drill with metal bits, wire strippers, crimp connectors, and a multimeter. While many drivers complete this as a DIY project, improper sealing is the number one cause of leaks, so take extra care with waterproofing or consider professional installation if you're not comfortable drilling into your cab.

What's the difference between LED and incandescent options?

LED cab lights draw 80% less power (important for battery life during extended idling), last 50,000+ hours versus 2,000 hours for incandescent, and provide instant-on brightness in cold weather. However, LEDs don't generate heat to melt snow and ice, which can be a concern in northern climates. Incandescent lights are less expensive upfront but require more frequent bulb replacements. Most of our LED options are DOT certified and include sealed, waterproof connections.

Are these lights DOT compliant, and what about different lens colors?

All cab lights we carry for the M2 Business Class meet DOT FMVSS 108 requirements for clearance and identification lamps. Amber lenses are required by law for vehicles over 80 inches wide. Clear lenses with amber bulbs are also acceptable in most states, but check your local regulations. We stock amber, clear, and smoked lenses. Note that smoked lenses may not be street legal in all jurisdictions and are primarily for show truck applications.

How do I prevent water leaks after installation?

Water intrusion is the most common issue with aftermarket cab light installation. Use a high-quality butyl tape or silicone RTV sealant rated for automotive use around each light base. Apply sealant to both the light base and the cab surface before mounting. Install rubber grommets in all wiring holes and seal them completely. Many customers also apply a bead of sealant around the entire light base after installation for extra protection. Inspect and refresh sealant annually, especially if you frequently use high-pressure truck washes.