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If you're into changing things up, you could always do an H4 conversion along with the relay upgrade. The H4 housing will give you more options as far as choice of bulbs go. You might want to check your grounds too, dim bulbs are usually the result of a poor ground.
My right bulb was dim. I added a jumper wire from the blub ground prong to a good ground which really helped. The problem was a loose ground wire screw attach point forward of the starter relay. So I fixed the loose screw and all is fine again.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.