ok so i changed the bulb changed the wiring harness and still light doesnt work it comes on and off after a bump on road all connections are tight still get light on periodically i dont know what is going on please any advice
The insulation on the wires inside the housing have probably turned brittle and are creating a short when you hit bumps. Wires are way undersized. You may be able to rewire or use liquid electric tape.
If so, As I tell others. File a complaint with the NHTSB. This is clearly a safety defect which should warrant a recall.