Stop Light/turn signal blowing bulb

[supercub]

I keep blowing bulbs on the left side of my travel trailer. Fuse remains intact. Any idea why the bulb would blow and not the fuse? What should I check?
Thanks

[StirCrazy]

how long do the bulbs last? and are you buying the cheapest one or decent one

[bucky]

By blow do you mean one or both of the filaments are broken or are they intact but just not working?

[JRscooby]

Bad or marginal ground can cause this issue.
Or even lose fit in socket.
Back when I ran incandescent bulbs in truck taillights I would put a half pea sized dab of silicone on the glass near base. Old hands said it helped, absorbed vibration before it got to filament. Seamed to help.

[WayneAt63044]

Wrong bulb number? Same bulb as the right side?

[ssthrd]

Check the light socket for corrosion. Maybe the bulb is OK......

I little vinegar on a q-tip does a great job cleaning contacts.