Frequently Asked Questions About Mack CV/GU Truck Driving Lights

Will these driving lights fit my specific Mack CV or GU model year?

Most aftermarket driving lights for Mack CV/GU trucks are designed to fit models from 2003 to present. However, mounting brackets and wiring harness connections can vary between model years. CV models typically have more standardized mounting points, while GU models may require specific brackets depending on your bumper configuration. We recommend checking your truck's VIN and model year against the product specifications, or contact our support team with your truck details for confirmation.

What's the real difference between LED and halogen driving lights for my Mack?

LED driving lights draw 60-80% less power from your truck's electrical system, last 30,000-50,000 hours compared to 500-1,000 hours for halogens, and provide instant full brightness. However, LEDs cost 2-3 times more upfront. Halogen lights are less expensive initially and produce a warmer light color that some drivers prefer, but they generate more heat and require more frequent bulb replacements. For Mack CV/GU trucks that run long hours, most drivers find LEDs more cost-effective over time.

Do I need to upgrade my wiring or add relays when installing these lights?

For LED lights under 100 watts total, your stock wiring is usually sufficient. However, for high-powered LED light bars over 100 watts or multiple halogen lights, you'll need to install a relay harness to prevent overloading your factory switch and wiring. Most quality driving light kits include the necessary relay harness and inline fuse. Always use at least 14-gauge wire for runs under 15 feet, and 12-gauge for longer runs to prevent voltage drop.

How difficult is the installation, and what tools do I need?

Installation typically takes 2-4 hours for someone with basic mechanical skills. You'll need a drill with metal bits (usually 3/8" and 1/2"), wire strippers, crimping tool, electrical tape or heat shrink tubing, and basic hand tools. The most challenging part is usually routing the wiring through the firewall - most installers use existing grommets or drill a new hole with a rubber grommet. Some Mack CV/GU trucks have pre-drilled mounting holes in the bumper, making installation easier.

Which mounting style works best for Mack CV/GU bumpers?

Mack CV/GU trucks typically have three mounting options: bumper-mounted brackets (most common), grille guard mounts, or roof/visor mounts. Bumper mounting provides the best illumination for the road directly ahead and is DOT compliant when properly aimed. The 16" and 18" steel bumpers on most CV/GU models have reinforced mounting areas that can handle lights up to 15 pounds each. Avoid mounting lights that obstruct your turn signals or headlights, as this violates DOT regulations.