Peterbilt 330/335/337 Lights

Frequently Asked Questions About Peterbilt 330/335/337 Lights

Will these lights fit my specific year model Peterbilt 330, 335, or 337?

Most aftermarket lights for Peterbilt 330/335/337 models are designed to fit trucks manufactured from 2005 to present. However, there were minor changes in mounting points between 2005-2007 and 2008+ models. Always verify the exact year range listed in the product description. For pre-2005 models, you may need adapter brackets or different mounting hardware. If you're unsure, contact us with your OEM number and we can confirm compatibility.

Are LED lights worth the extra cost compared to standard halogen bulbs?

LED lights typically last 50,000+ hours compared to 1,000-2,000 hours for halogen bulbs, making them cost-effective long-term despite higher upfront costs. They draw 80% less power, reducing strain on your electrical system and alternator. LEDs also provide instant full brightness and better visibility in fog and rain. The main consideration is ensuring your truck's electrical system is compatible - some pre-2008 models may require a load resistor or flasher relay upgrade for proper turn signal function.

Can I install these lights myself, or do I need a professional?

Most headlight and marker light replacements can be completed in 30-60 minutes with basic tools (screwdrivers, socket set, wire strippers). Plug-and-play LED options require no cutting or splicing. However, if you're installing auxiliary lights or need to run new wiring through the firewall, professional installation is recommended. Common challenges include accessing tight mounting spaces behind the bumper and ensuring proper grounding. Always disconnect the battery before starting any electrical work.

What's the difference between DOT-approved and off-road lights?

DOT-approved lights meet federal standards for on-road use, including specific beam patterns, brightness levels, and color requirements (white or amber for forward-facing, red for rear). Off-road lights often exceed DOT brightness limits and may have different beam patterns. Using non-DOT lights on public roads can result in fines and failed inspections. For work trucks that operate both on highways and job sites, we recommend DOT-compliant main lights with switchable auxiliary off-road lights for work areas.

Why are my new LED lights flickering or causing error messages on my dash?

This common issue occurs because LEDs draw less current than traditional bulbs, causing the truck's computer to think a bulb is out. Solutions include installing load resistors (6-ohm for turn signals, 3-ohm for marker lights) or replacing your flasher relay with an LED-compatible unit. For 2008+ models with CAN-bus systems, you may need decoder modules. Some premium LED lights include built-in resistors to prevent this issue. If problems persist after installing resistors, check your ground connections - poor grounding is the second most common cause of LED flickering.