95 F-250 light issue.

Hey guys, I'm pretty sure this is a easy question so I'm hoping for a answer quick since the police in my town hate my loud truck ha. Well I have a 95 F-250 and the front passenger blinker doesn't work. The marker light works so I know it's not the bulb unless it's one of the weird ones with 2 filaments. All the other blinkers work just fine so I'm not sure if it's the bulb or a bad wire.

Completely unrelated, my rear axle is slightly bent, how hard/time consuming is it to swap out for a used axle?

And for fun, it's a 460 with straight pipes, that's why cops hunt me down or I wouldn't be worried about the blinker ha.

It is a two filament bulb. Each filament is powered by one of the bottom contacts. Usually a new bulb takes care of it, but sometimes it is the contact. It is pushed against the bulb by a spring that can get stuck and no longer make contact or just break from age. There could also be corrosion on the contact points. A broken wire is also a possibility.