Frequently Asked Questions About Sterling A-Series Truck Headlights

Will these headlights fit my specific Sterling A-Series model year?

Our Sterling A-Series headlights are designed to fit model years 1999-2010, including the AT9500, A9500, and L-Line series. The rectangular sealed beam style headlights are direct replacements for 4x6 inch OEM units. However, wiring harness compatibility may vary between pre-2003 and post-2003 models. We recommend checking your existing headlight dimensions and connector type before ordering, or contact our support team with your VIN for verification.

What's the difference between sealed beam and LED conversion headlights?

Sealed beam headlights are traditional halogen bulbs encased in glass that replace as complete units, typically lasting 500-1,000 hours. LED conversions use the same 4x6 inch housing but feature LED technology that provides 3-5 times more brightness, lasts 30,000-50,000 hours, and draws less power from your electrical system. While sealed beams cost less upfront ($15-30 each), LED conversions ($60-150 each) offer better visibility and long-term value with lower replacement frequency.

Do I need any special tools or modifications to install these headlights?

Installation is typically straightforward and requires basic hand tools including Phillips and flathead screwdrivers, and possibly a 10mm socket. Most replacements take 15-30 minutes per side. Standard sealed beam replacements are plug-and-play with your existing wiring. LED conversions may require adapter harnesses for older Sterling models or those with daytime running lights. Some LED units include built-in resistors to prevent hyperflashing or dashboard warnings.

Which headlight style works best for night driving and bad weather?

For optimal visibility, we recommend LED headlights with a focused beam pattern and 6000K color temperature (bright white). Look for units with aluminum housings and polycarbonate lenses that resist moisture and vibration. Models featuring separate high/low beam LEDs provide better light distribution than single-bulb designs. For frequent fog or snow driving, consider adding amber fog lights below your main headlights rather than using yellow-tinted headlight lenses, which reduce overall light output.

Why are my new headlights flickering or triggering warning lights?

LED headlights draw less current than factory halogens, which can confuse your Sterling's computer system. This commonly triggers flickering, hyperflashing turn signals, or "bulb out" warnings on 2003-2010 models with CAN-bus systems. The solution is installing LED-specific resistor kits (usually 6-8 ohm) or choosing headlights with built-in CAN-bus adapters. For sealed beam replacements experiencing issues, check for corroded grounds at the headlight bucket or loose connections in the main harness behind the grille.