Arcon #912 Bulb 12V 12W Wedge Base, 2-Pack | RV & Marine

The Arcon #912 is a 12 volt, 12 watt incandescent bulb that ships two to a card, so you've always got a spare on hand. It's one of the most common miniature bulbs in the RV and marine world, and Arcon has built its name supplying the everyday replacement bulbs that keep interior lights, porch lights, and courtesy lights working. If a light in your rig or on your boat has gone dark and the old bulb has a flat glass wedge base, this is very likely the one you need.

The #912 uses a wedge base, which means there's no metal screw base and no pins to line up. The bulb is held in place by two bent wires that press against the sides of the socket. You pull the dead one straight out and push the new one straight in. No twisting, no bayonet lock, no tools. It's about as simple as a bulb swap gets, which is good news when you're reaching up into an overhead dome fixture or working in a tight cabinet light.

On an RV, you'll find the #912 and its wedge-base cousins all over the place. Interior dome lights, over-cabinet reading lights, porch and entry lights, and cargo or step lights often take this exact bulb. Pull your old one and check the number stamped on the glass. If it reads 912, you're in the right spot. The 12 watt draw gives you a warm, familiar glow that most owners are used to, the same light the fixture shipped with from the factory.

Boaters use the same bulb for cabin lights, courtesy lights, and other 12 volt interior fixtures. One thing to keep in mind out on the water: this is a standard interior-style bulb, not a sealed or waterproof fixture bulb. Use it where it's protected from spray and weather, inside the cabin or under a console, and keep it out of anywhere it'll take direct water. For exposed navigation or deck lighting you'll want a fixture and bulb rated for that job.

The #912 shows up in automotive and trailer work too, in places like backup lights, cargo area lights, and license plate lights on some vehicles. As always, the right move is to match the number on the bulb you're pulling out rather than guessing. Twelve volt systems are forgiving, but putting the wrong bulb in a fixture can mean it sits loose or runs hotter than the housing likes.

Here's the honest truth about an incandescent bulb like this one. It makes light by heating a filament, so it runs warm and it isn't as efficient as an LED. It'll also have a shorter service life than an LED replacement. But it's inexpensive, it throws a warm color that a lot of people prefer, it dims smoothly on a compatible 12 volt dimmer, and it drops straight into the original socket with zero fuss about polarity or electronics. For a lot of boaters and RVers, keeping a two-pack of these in the junk drawer is the easiest, cheapest way to never be stuck in the dark.

That's really the case for buying this two-pack. Bulbs fail at the worst times, usually at a campsite after dark or on the water when you're buttoning things up for the night. Having the second bulb already on the card means a thirty second fix instead of a trip to the parts store. Keep one in your spares kit and you'll thank yourself later. And because the #912 is such a common size, one card often covers several different fixtures throughout the same rig or boat.

Not sure if this is your bulb? Pull the dead one, look for 912 on the glass, and check that the base is a flat two-sided wedge rather than a round pin or bayonet base. If it matches, this Arcon two-pack will drop right in. If your fixture calls out a different number, grab that one instead so it seats correctly and runs at the right temperature.