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Bikr, you probably have a poor ground on the left side. Check the bulb sockets first, front and rear. Make sure they're free of corrosion, and give them a good shot of WD-40.
If that doesn't help, trace the ground wires to where they connect to the frame, and clean the terminals.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
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