Light bar
How many amps of alternator needed to install a light bar? Planning to add a light bar to my 2009 Suzuki carry.
If you plan to run a 100-Watt, light bar, it will need 10-Amps.
A good alternator should maintain battery voltage between 13.9 and 14.8 volts (14.2 is optimum). Even in worst case scenario with all accessories turned on, there should be at least 13 volts at the battery. In the same way, the amp rating of the alternator is matched to the vehicle's electrical system. Older vehicles with fewer accessories may only need a 70 to 80 amp alternator, while a newer vehicle with lots of electronics and accessories may need a 120 to 160 amp alternator. LED light bars can provide an outstanding amount of light with a comparatively small amount of required power. They also operate at far lower temperatures than halogen and are extremely reliable.