Monday, July 4, 2022


Keeping spare light bulbs is a bright idea

By Chris Dougherty

Chris Dougherty is a certified RV technician. Here is a story he wrote while he was serving as’s technical editor.

These days many new RVs come equipped with all LED lighting, which is great. LEDs last a long time and are very energy efficient. The rest of us still have good old-fashioned light bulbs that burn out.

Keeping a selection of light bulbs in your rig’s tool box is a great idea. This way, when you have a burnout, you have a replacement handy. Your owner’s manual should tell you what bulbs you need for the various lights in the rig, and I would keep at least two of each. If you don’t have the list, that’s okay – each fixture will say which bulb it needs on the back plate behind the bulb.

Don’t forget appliance bulbs! The bulb sizes will be listed in the appliance manual, or the bulb can be used to match one up, although some of them are specialty bulbs that may only come from an RV appliance service provider or appliance company.

Very important, and I can’t emphasize this enough: Do NOT change bulb sizes in these lighting fixtures. Replace them with the exact bulb that was in them! Here’s why: With interior lights, a larger-size bulb is hotter and thus can cause a meltdown of the fixture and a fire. The same goes for exterior lights. Marker, and stop/turn/tail lights must have the same bulb to maintain their FMVSS rating for visibility. If the wrong bulb is inserted in a tail light, it probably won’t work, or can even blow fuses.

Another problem I have seen is when the wrong style bulb is used in a fixture, like when a stop/tail/turn multi-filament bulb is used in an interior single-filament fixture. This can create a short circuit in the fixture, that can cause damage to the fixture or even a fire. Always use the bulb recommended in or on the fixture.



Notify of

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Inline Feedbacks
View all comments
Gail Black
11 months ago

I have a 2014 Starcraft ARone 14RB Extreme travel trailer. I’ve been trying to find the correct size led light blub for my five rear running lights. I do not want to replace the entire fixture, just the bulb. The 921s are too long. May as well let me know what led bulb I need for the break lights as well.

chris p hemstead
4 years ago

Replace any burned out Incan with LED. Quit using those heat generating power-sucking bulbs.

Billie Gunn
4 years ago

The 12 volt plug in type can be used for replacement? You don’t have to replace fixture?

4 years ago
Reply to  Billie Gunn

Yes, just match the bulb type. LED versions are available everywhere, including Amazon.

Sign up for our newsletter

Every Saturday and Sunday morning. Serving RVers for more than 20 years.