By the way, if they aren’t LEDs, replace them with LEDs. They’re brighter for a reason many people don’t consider: even if an incandescent bulb was as bright, by the time it’s 12V power goes through a bunch of small-gauge wire and a connector or two, it’s getting pretty weak power.
The LED doesn’t need much power and still shines at full brightness.
That’s also why you still want to own an incandescent 12V test light for troubleshooting.
LED test lights will glow on the faintest current, sometimes misleading you to believe a circuit is good when it isn’t.
