If only ONE headlight fires up this may be a wiring issue.
First, check all the vehicle fuses associated with the headlight systems. Sometimes a fuse can pop during installation and may need to be replaced.
If the fuses are good move onto the connections and plugs for the new headlight system. Ensure all the plugs are connected securely, that no plug pins have been pushed out and that any and all grounds have a GOOD connection.
Last – it’s possible that a bulb or ballasts failed for some reason – we test all the components before shipment, but sometimes things just fail. To confirm – try switching the bulbs and/or ballasts from side to side. See what the problem follows.
Posted in: Troubleshoot