The Big Dog Coyote uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers 2010 to 2011 model year specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9003 is an ANSI-standard dual-filament halogen bulb rated at 12 volts, with a high beam filament drawing 60 watts and a low beam filament drawing 55 watts. Its P43t base is a bayonet-style fitting widely used in North American automotive applications.
Because the 9003 contains two filaments within a single bulb, it serves both the high beam and low beam functions from one unit. The Big Dog Coyote uses this single bulb type across both headlight positions for the 2010-2011 model years.
The 9003 designation is the ANSI classification recognized in the United States and Canada. It is electrically and physically equivalent to the international H4 designation, which means bulbs sold under either designation are generally interchangeable, provided they carry the same wattage and base type.
The P43t base features three positioning lugs arranged asymmetrically around the base collar. This asymmetric arrangement ensures the bulb can only be seated in one orientation, which is critical for maintaining correct filament alignment relative to the headlight reflector.