Blinking tag lights

Hi and thanks for using 2CarPros.

Chances are the bulb inside is loose or there is a weak ground. First, remove the bulb and inspect the connectors where it mounts. Is the bulb tight when it is installed? Is there any excessive corrosion?

Next, check the wiring. Make sure the connectors are tight, not corroded, and in good condition. If everything appears good, using a test light, probe the wiring to the light until the test light turns on. Once it does, move the wiring around to see if the test light flashes. If it does, then suspect an internally damaged wire. If nothing changes, then you will need to perform what is called a continuity test on the ground wire. The wire that turned the test light on is power. Don't directly connect it to a ground.

Using a multi-meter, check the ground wire for ground. If it shows good, do the same thing. Move the wire around to see if there is a bad connections.

Here are a few links that you may find helpful. They discuss how to use a test light, multi meter, and checking wiring.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

With all of that in mind, I have to say. Most times either the bulb is ready to burn out or it is loose. Before I would go through all the test, I would replace the bulb making sure it is tight in the socket as well as making sure there is no corrosion in the socket. Most times that takes care of the issue.

Let me know if you have other questions or need additional help.

Take care,

Joe