Yes. A diode is like a flapper valve in a pipe. Flow only goes one way. Then end with the stripe is where the positive comes out. (I'm talking "positive" because you're talking about car parts, which are usually negative ground.) If you put it in backwards, the only thing that will happen is...nothing. Just don't put it in parallel. That would put it across the battery terminals and the battery would try to empty out in a matter of seconds, causing smoke and the crackle of exploding thermoplastic.
ps, there is a place to declare your country in the "profile", I think. Saves a bit of confusion.