For a few weeks my left turn signal has been out in the rear. I’ve been getting my head chewed off using hand signals because I kept forgetting to stop and get a new bulb. Well I got the bulb, and before I get the chance to put it in, I notice my signals not making a fast blink noise. Sure enough the original bulb is back to doing its job.

It’s not a big deal, except I have to get the inspection done soon. If the signal decides not to work again🤷 Is there anything I can do or check to help prevent that? What is likely to have been the cause? When the turn signal noise is fast on the cabin I thought it always indicates a failed bulb, but what is it actually detecting?