FORD F-SERIES BULB APPLICATION : H13 KNOWN ISSUES : 1. HID Bulb Flickering after vehicle is ignited. REASON : Factory Computer Module Conflict. SOLUTION : i. Purchase the H13 Bi-Xenon FORD System (Item #ALU-H13BXK6F or ALU-H13BXK8F) OR ii. Use a H13 LOW BEAM only system (Item #ALU-H13K6 or ALU-H13K8)