Taillight not working

Welcome to 2CarPros.

First, this vehicle isn't offered in the US, so my technical information is limited. However, to me it sounds like a bad ground. First, make sure the battery terminals are clean and tight, free of corrosion. Next, follow the ground wire to where it grounds on the body of the vehicle and confirm it is tight and corrosion free. Also, check the fuse box for loose fuses or ones that are damaged.

Here is a link that explains how a car's electrical system works. Take a look through it. Also, the second link explains how to check wiring and the third explains how to check the battery terminals and ground.

https://www.2carpros.com/articles/how-a-car-electrical-system-works

https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

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

Do that and let me know what you find.

Joe