Frequently Asked Questions About Mack CH/CHN/CHU Truck Lights
Q: Will these lights fit my specific Mack CH model year?
Most aftermarket lights for Mack CH, CHN, and CHU models are designed to fit trucks manufactured from 1988 to 2009. However, there can be slight variations between early models (1988-1999) and later models (2000-2009), particularly in mounting hole patterns and electrical connectors. Always verify the specific year range listed for each product, and if you have a transitional year model (1999-2000), we recommend calling our customer service team to confirm compatibility before ordering.
Q: Are these lights DOT approved and legal for highway use?
Most replacement headlights and marker lights we carry are DOT approved and SAE certified for legal highway use. Look for the DOT stamp on the product description or lens. LED upgrade lights should specifically state FMVSS 108 compliance. Auxiliary lights like fog lights or work lights may not be DOT approved for on-road use as primary lighting. If DOT compliance is critical for your application, verify this information in the product specifications or contact us for confirmation.
Q: Do I need to modify my wiring harness to install LED lights?
In most cases, LED headlights and marker lights are designed as plug-and-play replacements that work with your existing wiring harness. However, some LED upgrades may require load resistors or flasher relay replacements to prevent hyper-flashing on turn signals. Older CH models (pre-1995) might need pigtail adapters for proper connection. Each product listing specifies if additional components or wiring modifications are needed for installation.
Q: What's the difference between sealed beam and LED headlight options?
Sealed beam headlights are the traditional halogen style that came standard on most Mack CH trucks, offering reliable performance at a lower initial cost but requiring complete unit replacement when the bulb fails. LED headlights provide 2-3 times more light output, last 50,000+ hours compared to 500-1,000 hours for sealed beams, and use less power. However, LEDs cost more upfront and may require cooling fans. Consider your budget, driving conditions, and how long you plan to keep the truck when choosing.
Q: How difficult is it to replace the headlights myself?
Headlight replacement on Mack CH trucks is generally straightforward and takes 30-60 minutes per side. You'll need basic tools including screwdrivers and possibly a socket set. The main challenges are accessing the mounting screws behind the grille (which may need partial removal) and properly aiming the lights afterward. Marker light replacement is even simpler, typically requiring just removal of 2-4 screws. We provide installation instructions with most products, and many customers successfully complete these installations without professional help.
