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THis may be a dumb question but my rear passenger taillight/blinker went out for when I turn right or brake but the light still shows when I have my truck lights on? Should I just replace the bulb?
Yep, replace it, its a dual filament bulb. One filament lights the running light, then the second filament lights when you brake or use your blinker. You will need a 3157 bulb.