![]() If you find either of those, tighten/repair them as needed and then test the lights again. If the tester lights up yellow or red, or doesn’t light up at all, there’s a problem with the trailer’s wiring. After that, plug a tow-vehicle light tester into the vehicle’s tow-vehicle socket. To access the wiring, you’ll need to remove the tow vehicle’s tail light assembly. If you have an older trailer, it’s a good idea to inspect the wiring and replace any damaged or corroded parts. Wiring problems are more common in older trailers because they’ve had more time for the wires to become damaged or corroded. If you’re still having problems with your trailer lights after replacing the bulbs, then it’s time to inspect the wiring. Which brings us to our next point… Inspect the Wiring If the problem persists, then it’s likely there’s an issue with the wiring. If they’re not, they can vibrate loose and eventually burn out.īut if all the lights on one side of the trailer are out, there could be a problem with the wiring. Make sure the bulbs are securely fastened in their sockets. If one or more of the bulbs are burned out, replace them and then test the lights again. So, the first thing you should do is check all the bulbs to see if any of them are burned out. One of the most common problems with trailer lights is burned-out bulbs. How to Diagnose a Problem With Your Trailer Lightsīut before we get into how to test your trailer lights with a multimeter, let’s go over how to diagnose there’s a problem with your trailer lights. The most common method is with a multimeter. There are a few different ways you can test your trailer lights. In some states, you might even get pulled over if your trailer lights are not working properly. That’s why it’s important to test them regularly to make sure they’re in good condition. If they’re not working properly, it could result in an accident. Your trailer lights are responsible for communicating your intentions to other drivers on the road. Why Testing Your Trailer Lights is Important What do you do? How do you fix it? Don’t worry – testing trailer lights with a multimeter is actually a lot simpler than you might think! In this guide, we’ll walk through the process step-by-step and show you how to troubleshoot common issues. If you’re anything like me, the first time you hit the road with a trailer in tow, you had a moment of panic when one of your lights suddenly went out. ![]()
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