Turn signal light not working properly?

If your LED strip with dynamic turn signals on your 2021 Toyota Tacoma is not working when you connect it to the turn signal wiring, but it functions properly when the vehicle is in auxiliary mode, there may be an issue with the electrical compatibility or power supply.

Here are a few troubleshooting steps you can try:

Check the wiring connections: Ensure that the wiring connections between the LED strip and the turn signal wiring are secure and properly connected. Make sure there are no loose or damaged wires that could be causing a poor connection.

Confirm voltage compatibility: LED strips often have specific voltage requirements. Verify that the LED strip is compatible with the voltage supplied by the turn signal wiring. If the voltage is too high or too low, the LED strip may not function correctly.

Check for voltage drop: When the vehicle is running, the electrical system may experience voltage fluctuations or drops due to the increased load from the engine. This can affect the functionality of the LED strip. Use a multimeter to measure the voltage at the turn signal wiring while the vehicle is running. If there is a significant voltage drop, it may be necessary to install a voltage stabilizer or regulator to ensure a consistent power supply to the LED strip.

Please let us know what you find.

It turns out the voltage does drop when the car is on. what's a cheap, effective, and easy fix for it?

I believe you can buy a voltage stabilizer if you search amazon or the LED's manufactures website.